I need some help. I want to put a 3" BBL on my 2" Mdl. 36. I have a 3" BBL, a BBL pin, a longer extractor rod for the 3" BBL, and a center pin of the correct length. The extractor rod for the 2" BBL has a flange on it to retain a spring. The longer 3" BBL extractor rod does not have a flange...