c654 K random shadow

[Synaux]

Thanks for sharing!
it's crazy how many problems a drum can cause.

I dont know how this could happen. I half-expected to see a degraded tooth on the gear spline on the drum itself, thus creating a timing issue (even know it somehow self-corrects). Those units are fairly barebones, so I do not know what could cause this at this point. I kept it anyways, because it would still be useful for K production only.