MPS, I'm going to open one up- Test Results Options

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Awhile back Lew Mengle gave me a beautiful looking MPS which he thought was rebuilt. I ohmed it out (I did this first in hopes that if it passed this test it would have a much better chance of passing the next test) and it tested OK. Next I checked to see if it would hold vacuum. Failed. Miserably at that. Couldn't get it to go beyond 5 no matter how fast I pumped that vacuum pump. So I tucked it away.
Last week I ordered 2 of the unobtanium diaphragms (that Chris @ Tangerine Racing is offering) so I thought I should get a head start on replacing one using my spare MPS.
I don't mind telling you that I've always felt intimidated by these things so I'm looking forward to this about as much as fighting the school bully. My goal is to open this up without destroying it, clean it up and hopefully understand how to install the new diapragm and then return it to a setting that is very close to original. At that point I would hand it over to someone else to set to spec's with the proper equipment.
I'm a little suspect of this particular unit as it appears someone's tinkered with the numbers. More to come in the following few days.