Hello,
My factory service manual says there is a special tool for adj. the throttle spindle lever stop screw on the valve body.

I have heard of people using a straight punch to completely compress the throttle plunger into the VB

And making the correct gap (measurement) and locking up the set screw.

Question is what is that measurement ? and assuming the the gap should be measured with the spindle stop tab against the screw head.
Thanks Jim