Undercutting Brescian-style f holes


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I am currently making an instrument based on a Brescian pattern.   One thing that I am contemplating doing is undercutting the f holes.   Gregg Alf mentions this on his blog, and John Dilworth also alludes to this practice in his writings.

 

This is not something I have tried before, so I am interested in any tips or advice that others may have on this.   My assumption is that I am aiming at the kind of profile depicted here in the Courtnall & Johnson book:

 

post-25087-0-86851200-1397138069_thumb.jpg

 

One question that occurs to me is whether this is applies all the way around the f holes.   The reason for the question can be seen in the attached picture I took of a Maggini violin:

 

post-25087-0-26452100-1397137788_thumb.jpg

 

To my eye the wood around the upper eye does not appear to have been undercut.   For comparison consider the wood near the f nicks.    Is this variation significant, or not?

 

As I say, any help you can offer gratefully received.

Cheers,

Ed.

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