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Monte --
John's right -- removing the TB for cleaning is really easy. The only concern is breaking the gasket (which probably won't) so some Bricksters have a spare gasket. If I broke one, I'd cut a new one from heavy magazine cover paper (National Geographic is good). Or mend the old one back together with a touch of RTV -- it's not a demanding application.
The mechanical stop is a setscrew on the forward side of the TB aimed up. It has a nut (8 mm, I think) on the underside. It's right near the big coil spring that turns the throttle to idle. When you turn the throttle and allow it to return to idle position, you can see a small arm bear against this setscrew.
The throttle switch is on the backside of the TB, opposite the setscrew, and is locked by two small screws. It has an electrical cable plugged into it.
With the TB off the car, I first loosened the switch so it didn't inadvertently act as a stop (very bad for the switch!). I backed the setscrew out until the throttle butterfly plate was completely, jammed shut. Then I turned the setscrew in until it just touched the arm, and another 1/4 turn. This takes the mechanical force off the butterfly, so when the throttle slams shut, it doesn't wear the butterfly or damage the switch. Don't forget to tighten the locknut, and then recheck the adjustment -- tightening the locknut can change the screw position slightly.
Then, with the throttle at idle position (the spring forces it there), you carefully turn the switch until it goes "click". Tighten the two screws. Be sure, as you rotate the throttle (TB still in your hands) you can clearly hear the switch "click" and that it does it while the arm is maybe 0.030" off the setscrew.
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