9815/9825 Capstan

[Craig Bladow]

My 9815 capstan is 3/8" (0.375 inch), cruff in another thread stated that the outer diameter is nominally 0.425 inch. 3/8" inch inner diameter tygon tubing is commonly available, however the wall thickness is too much. I'm curious as to how one goes about mounting tubing on a lathe (or drill press) so the outer diameter can be reduced.