So as promised I did run the table 24 minutes before playing a side. There was still the same improvement across the first side, but it seemed to be starting from a higher level. So motor and bearing are probably at least a part of it.
If you think that's the exception rather than the rule you have much to learn, #27.
Gosh Millercarbon is spot on for a change!
If you think that's the exception rather than the rule you have much to learn, #27.