Holley
Well there is an issue with the helcoils already installed. I realize the stainless is harder than just a regular thread, but thought I could get a tap to chase a present thread. No luck there. I can't see anything wrong with any of the helicoils, they don't look bad. The carbs were together and running when the engine came here for rebuild. It was just an after thought to go thru the carbs. The original screws came out fine, but won't start again. I have had to pull out helicoils in the past, but never on this small of thread. I have chased the threads on the screws with a adjustable die and they go right in the good carb threaded holes.
If I can get the old helicoils out without damaging the threads in the carb body, I now have new helicoils to put back in.