Picked up a Brown and Sharpe 1" 13RS micrometer off e-bay cheap a while ago. It was listed as 'stuck' - a couple drops of Kroil and a little patient work and she's working fine.
In the wooden box are three octagonal pieces of steel about .370 thick one marked '1', one marked '2', and one marked '3' on the flats of the octagon.
I assume they are standards of some sort but can't seem to figure out how to use them. Any ideas?