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What sort of "incident" could cause cal standard load to become precessed?

Question asked by drkirkby on Oct 26, 2013
Latest reply on Oct 30, 2013 by drkirkby
Someone asked me to look at their very old 85033B 6 GHz 3.5 mm cal kit to see what condition it is in. 

The female load, marked "Maury Microwave 8031A1" shows a precession of 0.00035", as measured on the connector gage from my 85052B cal kit. The load is not a precision slotless connector, but has 4 slots. That amount of precession is higher than the uncertainty limits of the gage (specified as +/- 0.00016" on loads), so I can be pretty sure this is not in good condition, and risks damaging things if mated with them. 

I'm puzzled what sort of "incident" could actually cause a female pin on a Maury Microwave load to become precessed. I can understand a male pushing in too hard could cause it to becomes recessed. Also, if it was an adapter I can understand what could happen. But I'm a bit puzzled what would cause a female load from a decent manufacturer to become precessed. 

BTW, does anyone happen to have a manual on the 85033B and/or know the coefficients?