Using clear plastic tubing to protect the teeth of a table saw blade is a great idea. I found a simple solution to the dilemma of slicing one side of the tube straight and safely. All it takes is a couple of scrap pieces of MDF, a piece of double-sided tape, and a blade from a utility knife. The steps below show you where to start. I used a brad point bit that is just slightly bigger than the tube I was going to slice. To create the opening for the tube, clamp two pieces of identically sized MDF to the drill press fence. The blade is held in place with a piece of double-sided tape. Next join the halves and clamp them in your vise. To start, push the tube through the opening without turning or twisting it. Once clear, pull the remaining length through the block.