One of the many things that I love about having a lathe, is the fact that it makes it so much easier to get a consistent result while tackling some of the more tedious tasks in railway modelling.
A task that I have aways found tedious*, is cutting/filing crank pin bushes to length so that they allow some play in the coupling rod and don’t bind or unscrew themselves when running in reverse.

*Mainly because although I can follow a line with a saw without too much difficulty, I really struggle to file surfaces at 90 degrees to the edge.
To get around this on the 8F, I turned up a little Arbor from some mild steel bar (more recycled toner cartridge rod). I threaded the end 10ba and using a 10ba nut, I was able to fit the tapped bush on the end then lock it with the nut and quickly and consistently remove 0.9mm from each one.