So I went down in basement and looked. Tested Stock =3 and I have a few mirror mounts. These do not have the notch in the shaft for the mirror. Your amps are flexible enough to deal with this.
If you loosen the set screw, remember, you have to recalibrate zero using a bench laser, a clamping hemostat, to hold the shaft, an oscilloscope etc... Placing an uncalibrated rebuild into drive will damage something for sure. There are portions of the rotor milled to 10 micron tolerances. Those portions form the grounded plate of four air variable capacitors in the position sensor. The capacitance change is very small, on the order of femtofarads per image point. To sense that small a change, they use a very high frequency, high voltage to excite the capacitance bridge.
The "gunk" is usually red potting compound. Used to prevent tampering on defense electronics. Red is the soft version, and that comes out with a tiny drill bit and a pick tool.
When you drill it, you must not damage the head of the Allen screw. This means drilling by hand using a pin-vise.
Run the "AA" battery tests, too.
Steve
Last edited by mixedgas; 10-22-2014 at 05:39.
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When I still could have...