Thanks for the information guys. I got the new block built and installed. There is now 0.005 gap, I also installed a spacer made from HDPE between the forward pivot arm and the casting to keep that arm from shifting left and right. There is no more loud knocking sound and the tell tale marks I was getting on the work on the return stroke are gone. She is cutting nice and smooth now. The audio in the video seems much louder than in person, the clicking sound is the auto feed for the table. I also built a spacer block so I can get rid of the Armstrong tool holder and hold the bits directly in the clapper.
Shawn
Shawn, proud to be a member of MetalworkingFun Forum since Nov 2013.