Originally Posted by
oneclick
Bearing balls[1] are accurate to 0.000025, your "0.00138..." is roughly fifteen hundred times larger.
[1] typical ones, higher spec ones exist, as do lower ones - if you are only adjusting with a toothed washer you might as well use them.
Or maybe round shot.
I just counted but there are 40 teeth on a washer/adjustable race. That works out to 0.0010416666, So if it is tight and you loosen it one tooth, that give a clearance of about 1/3 of an average human hair or 1/3 of the thickness of typical printing paper, plenty of space for a good coating of grease
If you can adjust a bearing to those specs I am quite impressed.
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