I am going up on the Teflon and spacer thickness to 3/8 inch from 1/4 inch.
Too hard to fasten the 10-32 throttle cable to the button.
It makes a marginal connection to a button only 1/4 inch thick.
If you use the 3/8 Teflon then McMaster Carr has off the shelf steel spacers
that will work as buttons. Much, much, much easier than making your own.
You would need a lathe anyway. I spent four hours today fooling
around trying to make a good button.

McMaster Carr 3/4 inch OD  3/8th inch long 5/16th ID steel spacer part
number 92415A455 $3.32 well worth it.

Also buy the precision ground  blanks in Teflon. McMaster Carr
part number 9711K2 for 3/8 thick 4 inches wide and 12 inches long.
Expensive but well worth it. +-.005

I got some 1/4 Teflon sheet and the thickness was all over the place.
Too wavy. Sure to lead to problem. +.038 - .019 in 3/8 thickness.

I thought a lot about this and this is still the best way to
go. It is way over kill but you don't want the throttle cable
to become disconnected from the slide. One of those things
you don't want to fool around with.

Paul Lamar

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