A fellow builder showed me a machine he is building that was inspired by my work and suggestions. He used a high quality linear slide and a linear bearing at the forward end of the mail shaft. I was a little concerned about stability of the new timing belt design and also about excessive wear to the vee rail over time. Using his example I made a simple guide bushing for the front of my machine. I think it will be a significant improvement. Here is a picture of the new bushing. Then a picture of the new slate base added for stability, and finally all the detail pictures for the timing belt machine. Most of the pictures were taken before the front bushing was added.