Hi Stew,
I've not been having a good time with the tuners on this bass, two of the gears got chewed up very quickly, Thomann sent me two replacements no hassle. However when I changed the strings after installing the new bridge, again the gears started to get chewed up and causing the tension to slip. I managed to tune up but I don't think they will last long now. I even lubricated them a little with some Vaseline as suggested a while back, but it seems the metal that the gear is made from is just way too soft for it's intended purpose.