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I recently purchased a "new" wood violin bow on eBay with a broken tip. I easily repaired the cracked wood using super glue and a short segment of 4.5 mm diameter carbon fiber rod bored perpendicular to the crack.
Once assembled, I noticed that the stick has a slight twist and the hair is not properly aligned. I went to Youtube and noticed that bow makers set the camber of the stick by heating it with an alcohol flame. I think that I can do this to remove the twist, and since I only paid $12 for the bow I can be pretty brave in the attempt. However, I don't want to do a lot of varnish refinishing (assuming success) if I can avoid it. I saw a Youtube video where the varnish was covered with a anti-oxident coating before the flame was used on it, but naturally the material was a trade secret and I don't know what the material was. I hate videos like that.
My first thought is to use a silicone grease since it is stable to about 800 F and the wood becomes limber at about 330 F. I also have a anti-sputter paste that is used on mig welders to protect the electrode that may also work. I have no idea on how to remove these materials from the stick, but Simple Green is my guess. Any suggestions, particularly those having previous successful experience, would be appreciated.
I got some more information. I received a PM from someone that took a bow making and restoration class which "used a brown block of something that looked like buffing compound to run on the stick to protect the varnish during bending and cambering." She gave me the instructor's name and I sent an email today. I will report back if I hear anything.
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