Hey Paul,
The link on your website isn't working:

_..... INTAKE SYSTEMS, SLIDE THROTTLES &  P-PORTS_
(http://www.rotaryeng.net/intake.html)

I think I used to be able to get to the 20B slide throttle drawing  there.
Do you have a CAD file of the 20B slide throttle you can  send?

Don


Thanks for letting me know. That happens every once in awhile. My provider is investigating what happened. It is working now but I am not sure it is up to date.

Here is a dwg of the 3 rotor slide throttle. This one requires 3/8 thick Teflon
and a 3/8th thick spacer.

What brand of CAD program do you use?

Paul Lamar