It would be interesting to hear your judgement on the Igus slides when you are done!
I'm not sure what you mean by the "tapping a bushing" comment? The thing is, I want to rigidly attach a timing pulley to my leadscrew journal, for driving the screw. But since the journal is so small (only 10 mm dia) and also smooth, it's difficult to find a pulley that would grip the axle well enough.
There are pulleys with something called taperlock bushings that would work well, except these have a too big dia for my journal. So now I've found a "loose" taperlock-style bushing that you can place between the hub of the pulley and the axle, that expands and therefore holds the pulley in place on the journal. Only they're a bit expensive
Arvid