Slide a piece of rubber fuel line over the switch stem when you mount it. It will save a ton of frustration getting it to work correctly.
No.
The mistake folks make that leads 'em to poke some rubber hose over the switch stem is that the switch is self-adjustng
AFTER you take the time to set the initial position of the switch. Ideally, this is done after you pull the switch apart to polish corrosion off the conductors, and clean-out all the hardened, decades-old grease and reapply fresh lube. (Plain white grease is fine.)
Once the switch has been over-extended, they add thickness to the stem so that it still works right--but the better, proper solution is to merely push the spring-tab, and return the switch to it's starting point. From there, you whack the throttle WFO, and it "ratchets" to the correct position.
Adding to the problem is that
it's really common for the gas pedal "rod" that pulls on the throttle cable to get bent from overly-stiff throttle springs, or pushing the pedal beyond what it takes to fully-open the throttle. This results in less movement of the switch stem. So make sure the gas pedal rod is able to pull the throttle completely open without the pedal having to be forced hard into the carpet pad.
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The actual "ratchet" mechanism. It's POSSIBLE but unlikely that the ridges in the plastic would be worn by the points on the copper conductor that ride on the plastic shoe.
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