Violin Bridge warped treatment

[Niko Luthieria]

Hello, I have an old Despiau bridge made C (one tree), which once warped, and I straightened it using a clothes iron (I saw a luthier do this with a wooden bridge).
However, I was wondering if there’s any kind of heat treatment or similar method I could use to make my bridge more resilient.
I thought about straightening it again with the iron and then quickly placing it in the freezer. Perhaps rapid cooling could help it stay in a firmer position.
What do you think about this?
I will eventually replace the bridge, but I need to raise my fingerboard as it’s currently too low. By the way, do you think it’s a good idea for a beginner (whose "teacher" is the internet) to attempt raising the fingerboard themselves, or should I go to a professional luthier?
 

[Andreas Preuss]

2 hours ago, Niko Luthieria said:

Hello, I have an old Despiau bridge made C (one tree), which once warped, and I straightened it using a clothes iron (I saw a luthier do this with a wooden bridge).
However, I was wondering if there’s any kind of heat treatment or similar method I could use to make my bridge more resilient.
I thought about straightening it again with the iron and then quickly placing it in the freezer. Perhaps rapid cooling could help it stay in a firmer position.
What do you think about this?
I will eventually replace the bridge, but I need to raise my fingerboard as it’s currently too low. By the way, do you think it’s a good idea for a beginner (whose "teacher" is the internet) to attempt raising the fingerboard themselves, or should I go to a professional luthier?
 

To my experience once a bridge warped it is impossible to stabilize it again. For a while I bent bridges without using moisture which would keep them straight a little longer. I think I tried also to cool them down as quick as possible, but since I can’t remember any surprising positive result I suppose it didn’t make any difference. 
 

Therefore I came to the conclusion it is easier to make a bridge from the beginning which never ever can bend. So now I am reinforcing all my bridges with 1mm carbon fiber rods. It’s not too much work and really a rewarding effort. 

[GeorgeH]

I have used a vegetable steamer to stream it for 10-15 minutes or so and then flatten it under something heavy for a few hours or overnight. This has worked well, and the bridge will stayed straight as long as you correct it if it is bending slightly.

If you like your violin, let a qualified luthier raise the neck possibly using a "New York reset."

[M Alpert]

 

1 hour ago, GeorgeH said:

If you like your violin, let a qualified luthier raise the neck possibly using a "New York reset."

I agree, if you like your fiddle, and it is worth more than the cost of the repair, have a pro do it.

That said, raising the neck angle is usually quite easily done, (if you know what you're doing!) I'm sure you can find instructions for doing it by loosening the upper block and fitting a small wedge into the mortise, before regluing the top to the block. A rather harmless and easily executed procedure.

For straightening warped bridges, search for Michael Darnton's microwave method, I found it very efficient. Though I agree with Andreas, once it has warped it will likely do so again.

[GeorgeH]

1 hour ago, M Alpert said:

Though I agree with Andreas, once it has warped it will likely do so again.

That is interesting. My experience has been that the bridge relaxes into the its original shape in the streamer and will work as well as before as long it is checked regularly for slight distortion and pulled back straight (like any bridge). Maybe the bridges I have straightened this way have not been warped as extremely as others'.

[FiddleDoug]

" do you think it’s a good idea for a beginner (whose "teacher" is the internet) to attempt raising the fingerboard themselves, or should I go to a professional luthier?"

I would never suggest, or approve of a totally inexperienced hack attempt something like that!!!!!! If someone were to come to me and say "I tried to raise the fingerboard myself, and something went wrong.", I would automattically double the cost of the repair!

[M Alpert]

2 hours ago, FiddleDoug said:

Outrageously funny! O if only I dared!!

@GeorgeH I admit, I don't have loads of empirical evidence. Perhaps it's more of a superstition, but certainly have witnessed more "repeat warpers" than "cured straightened". Uff, sounds disturbingly old fashioned. Well, you get the drift.

I prefer my bridges decidely triangular for this reason, particularly for cello. The carbon fiber rod idea is intriguing.

[La Folia]

I suppose the warping is repeated for the same reason it warped the first time:  someone isn't taking proper care of it, and has no idea how to take care of it.

[Nick Allen]

On 4/19/2025 at 3:15 PM, M Alpert said:

 

For straightening warped bridges, search for Michael Darnton's microwave method, I found it very efficient. Though I agree with Andreas, once it has warped it will likely do so again.

I use this method and it's the best. 

It also really straightens the ankles, which is hard to do with mechanical straightening or pressing out. 

The other bonus is that it dries the bridge right then and there, so you can scrape the feet and pop it right back on. 

[Bodacious Cowboy]

On 4/19/2025 at 8:15 PM, M Alpert said:

 

I agree, if you like your fiddle, and it is worth more than the cost of the repair, have a pro do it.

That said, raising the neck angle is usually quite easily done, (if you know what you're doing!) I'm sure you can find instructions for doing it by loosening the upper block and fitting a small wedge into the mortise, before regluing the top to the block. A rather harmless and easily executed procedure.

For straightening warped bridges, search for Michael Darnton's microwave method, I found it very efficient. Though I agree with Andreas, once it has warped it will likely do so again.

"If you know what you're doing" is doing some heavy lifting here.

I would not underestimate the potential for undesirable outcomes if this "easily executed" procedure is carried out by unskilled hands and/or an insufficiently informed brain.

[Mark Norfleet]

8 minutes ago, Bodacious Cowboy said:

"If you know what you're doing" is doing some heavy lifting here.

I would not underestimate the potential for undesirable outcomes if this "easily executed" procedure is carried out by unskilled hands and/or an insufficiently informed brain.

Agreed.

I’ll also add that it’s not easy if it doesn’t go well even if one does know what they’re doing.  Not to mention the special clamp usually needed to insure that the joint under the fingerboard is secure.  It’s also not uncommon for that area to be a mess on older instruments.

[nathan slobodkin]

I seldom see bridges warp if the player straightens them when needed. Occasionally I see an instrument come in with a badly leaning bridge which has not warped but not too often. I can usually straighten a warped bridge in about20 minutes but since I am then handing it back to someone who doesn't know to straighten their bridge it doesn't surprise me that it warps again. On the othe hand I have instruments of my own which have had the same bridge for 25 years and show no sign of warping because if they start to lean I adjust them immediately. While I do put a slight chest on the back of my bridges (about 1/3 as much as the front) the general shape is a right triangle with the 90 degree angle on the back. If the player straightens the lean before the front goes past 90 degrees to the edge of the top then the bridge will not warp. 

[Niko Luthieria]

thank you all for all the information and tips, very helpfull. 
thank you very much

[Strabo]

The clothes iron method worked fine for me. Now I’m careful to keep a watchful eye on the bridges of my fiddles, straighten them as soon as I notice any lean.

[Niko Luthieria]

On 4/22/2025 at 3:18 PM, Strabo said:

The clothes iron method worked fine for me. Now I’m careful to keep a watchful eye on the bridges of my fiddles, straighten them as soon as I notice any lean.

actually the clothes iron method and the hot air method didnt work very well for me, next time i will try the microwaves method.