I finally managed to get the damn bearing blocks free on the Z screw, after about 3 hours of playing with my hair 😆
I could see metal filings at the bottom of the crown gear housing, hopefully not from the gear. Although this part did have a tiny smear of oil, maybe what ran down. I’ll use synthetic grease here if I can possibly locate any.
I’m also thinking about trying to fit a grease point so that I don’t have to remove the elec pack in order to grease, but that idea is still in the consideration stage 
