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Hello all. I'm a novice maker without a guide and am learning about making the purfling channel by many trials, even more errors and baptism by fire! I'm not very good at making the channel by hand ... definitely an art and am in awe of those who skillfully make them! I've been investigating using a Dremel since I have a small one and have seen Michael Darnton's jig, but since I don't have the "pencil" Dremel accessory, I made a jig based on the one I've seen at Stewmac, but adapted for violin C bouts. I ordered two carbide router bits (1.2mm) from a violin making supply outlet and waited patiently for them to arrive 10 days later. Started practicing and found out all about the dangers of slight movements and how unforgiving it is. With practice I got better. Just as I was feeling more confident with my skills, I broke one of the two bits I ordered. So now I'm trying to figure out what I did wrong and would appreciate your thoughts. Cutting in maple and I may have wedged the bit slightly as I moved with the grain from the practice C bout corner to lower bout. To my horror I broke the bit. Freud would say I knew I would break it, hence I bought two! I'm using a carbide bit and I've seen a few threads saying carbide bits were too fragile. I don't know about the speed I should use either - running at full tilt at 35,000 rpm. Maybe I fed the bit too fast. Could anyone recommend what material I should be looking at for the bits, speed to set the dremel, where they've purchased theirs and any tips they might want to share? Greatly appreciated! Pete