vintagemotif,
Got the PM and responded.
Tomorrow I'm going to try this tubing on my #5 treadle. For some reason the leather belt on it just keeps on stretching. Pretty hard to do anything with the machine slipping every time you work the treadle plate.
I also have another experiment I'm going to use the tubing on. My Greyhound machine uses a real odd sized belt. I can get belts longer and shorter, but not right for this machine. So, I'm gonna try the tubing idea. If it works it will remove a lot of the strain from the motor.
I'll let you all know what the results are.
Joe