o_holter, did you ever get the 300rpm motor set up on the 19? I have been having a lot of interest in doing this but everyone I talk to about it at vpi seems to discourage it.
VPI motor - upgrade to 300 rpm?
I hsve a HW-19 mk 4 plus or something, with the Black knight platter and inverted bearing, along with the SDS, The SAMA is the Hurst 600 rpm. This has run, now, for five years. Recently I have had problems with pitch variation, not easy to locate. The problems have been somewhat solved by glueing the pulley to the shaft and by oiling the motor, helping a lot, but perhaps not fully. Should I order a 300 rpm motor and new pulley? Advice is appreaciated, especially, experiences going from the 600 to the 300 rpm motor.