BBD Vacuum Piston Gap Adjustment

[MDJEEPER]

Guys,

I'm trying to adjust the vacuum piston gap on my BBD (at least until I dump or rebuild the carb). The fsm says the gap is supposed to be .035. To measure this gap, I am inserting little ignition feelers under the silver tang as far as I can get them. However, no matter how far I adjust the set screw, the feelers I'm using remain sloppy loose in the gap. So, I am obviously doing something wrong.

What's the secret to measuring the gap correctly? Am I even measuring the right place??

 

[priceg]

It's a bitch. You are looking for a small air gap between the upper and lower tangs. .035 is correct.May the force be with you.

 

[MDJEEPER]

It's a bitch. You are looking for a small air gap between the upper and lower tangs. .035 is correct.May the force be with you.

Thanks! Any specific tips at all to get that measurement somewhere near accurate??