Update - replaced the PTFE thrust pad with one I made from Lignum Vitae as it's a harder material and well regarded for bearings. The PTFE pad had formed a 2mm wide indent. Replaced the Synthetic gear oil I was using with some Redline 0w10 race oil. This is much less viscous than normal synthetic motor oil, has fewer additives, and is claimed to have a higher film strength and extreme slipperiness!. With the bearing assembled the shaft certainly spins more freely than with either the technics oil or motor / gear oils. May be too thin for some TT bearings ( certainly for my Systemdeck IIX900) but for the tight clearance techy bearing it could be the ideal oil?. £16 for 1l so not too expensive either.