First of all, i've found an incredibly easy way to make wood shafts identical to the originals: i apply a bit of putty around a needle/rod and roll it repeatedly on the handle of my cutter, finishing at an angle in order to create some irregularities in the pattern.
The first time i probably didn't apply too much pressure and in the end the grain was barely visible: some light passages with coarse sandpaper along the wood grain did the trick👌