Tentatively asked Daniel S if he had any in the pipeline and was impressed he got me sorted out with a Thinkpad before he went on his hols. When he gets back he'll have a few more ready to be shipped out. Super easy transaction and a nice chap.

Simple enough - just check the width of the ones you have taken out and compare it to the specs of a 6306 from any supplier. If they're the same then it must be an internal dimension - and the only width which can now be different is bigger track (and balls). So that might explain part of the cost o...

SH = Single-row deep groove bearing, wider than standard. From the SKF / MRC handbook.

Brilliant. Threads in the crankcase can take a beating with regular oil changes and this avoids all of that (all well as having to find a new washer everytime.) Ever stripped an oil drain screw thread because you didn't have a torque wrench?