Drum grip on shaft

[piotrb]

Hey,

Love this mod :)

I'm having a bit of an issue with the drum actually gripping properly on the 8mm shaft.

Filametrix uses screws to add additional grip on their drums, would something similar be possible?

Right now I jammed a bit of TPU between them, not ideal, but at least it helps, heck if this was the official way, and the drum shaft "corners" were a little a bit bigger to actually fit some filament, it may be enough, but screws could work well too, given the tire is over the drum, it seems like it wouldn't be a big deal if there was a few slots for screws underneath gripping the shaft.

Thoughts?