I picked up a Disston D-23 that was hiding under an astounding amount of crud last week and have been cleaning it up. The plate is straight and the handle is a 5-screw held together by an detailed application of electrical tape. The tote is in about 5 pieces. I have some apple from an old tree that went down and have cut some blanks. The cut out for the blade is very thin. It is the same thickness as my fine pull saw, but the back of the blade is rounded (approx 3" radius) as is the blade cut in the tote. Any ideas on how to cut that rounded portion?