builder;
I have been bending through bolt guns for 25 years now. If the bolt and the hole are the same size, I oversize the hole one drill bit size. This will allow the stock to move about 3/8" either direction with no problems. Always use the bolt fully tightened to the wood. It will move inside the hole. If you want you may reduce the size of the washer to allow for more movement too. The pressure is still the same as on a S X S. Heat the wood to the proper temperature and it will move easily. I have a very good success rate for draw bolt stocks. Just do not be in a hurry and allow the stock to fully "set". I leave my pressure on overnight so as to make sure the set is permanent. I have very few do-overs.
