Widening FP hole?

[orionengnr]

Did you ever determine the correct dimension, and see where your part sits?

If I read it correctly, you on your third FP and at least your second spring. Parts/spring changing and modifying parts, etc...a lot of misguided effort, IMHO...until you know which part is actually out of spec, you are Band-Aiding the problem.

 

[drail]

If you manually press the pin into the slide while it's pointed straight up as far as it will go with no spring installed it should fall back out under its own weight. If it doesn't it's wedging or binding in the hole. Reshaping the pin's taper should stop it from sticking.