Here is what I believe. There are several patterns out there that is supposed to help you put more hold down pressure on your blade , if you uses it. Steve Good has made one of the patterns for free, on his web sight. They really do the job well but a word of caution. They also put much added strains on the saws thumb screw. I made one for my saw because the blades seem to work loose as I was cutting a pattern and this added wooden piece that was put over thumb screw accomplished what I was after. I was really happy that I had discovered this helpful pattern. However, in a rather short time, I discovered that my had stripped and I was now waiting a replacement for my stripped part. Shortly after replacing my set screw, I read an article that was warning against using such a device on my saw because it would eventually cause the thumb screw to stip. What now ? Then I read about the thin layer of protective oil on the new blades and that they needed to oil free. I found out I needed to clean off that oil layer. I use a small piece of sandpaper that I always have by my saw. Never does another blade get put into me saw until it is sanded on both sides of each end of the blade. I only need to hand tighten the thumbscrew, with no kind of additional tool. That was several years ago and I have not had another thumbscrew stip on me since.
Dick
heppnerguy