Joe,
1.Get ahold of a Wavetek to calibrate where the machine stop hits the diaphram, note the reading.
2.Remove the expoxy plug carefully. Screw in the machined stop softly til it stops. Pick out ALL of the expoxy stuck in the fine threads and then back out the machined stop. Clean the threads some more so it threads in nicely.
3.Start engine (should be warm already) hook up the LM 1 and adjust the inner screw to 13.7 to 1 @ 25 rpms. Should have to turn it a 1/4 turn or so.
4.Screw in the WOT machined stop and adjust to the noted calibration. Check the A/F at WOT by doing it in quick runs and resetting the machined stop. Use the Wavetek because in the end the machined stop MUST be in contact with the diaphram at rest or you WILL blow it out in short order.
5. Expoxy the machined stop in so it doesn't move. and note the final readings on the Wavetek so you can reproduce this again if you have to adjust another MPS.
Geoff BTDT