I have had a Goldmund Ref for well over 30 years now. At the time when I bought it, it seemed a breakthrough to new shores of listening pleasure. But soon the linear arm started mistracking, made rumbling noises when the servo set in. Also the table was not quiet. So together with friends we redesigned the arm completely, put in new rails, silenced the driving mechanism and by adding another motor with new electronics could now change VTA on the fly from the listening position while the record was playing.
No more fiddling with those flimsy screws which always were a bitch to allign properly to get VTA right. We also reworked, shaft, bearing, bottom plate all to much closer tolerances und put heating in to keep the oil at even temperature.
It was a long labour of love, but to this day the TT sings.