I am new to S&W revolvers. I have a 1941 M&P that I would like to put a lanyard swivel on. Right now there is just the hole. I took the grips off, and the pin is present. Am I just taking out the pin, inserting the lanyard, and resetting the pin, or is there another step? Does the pin get pushed in by hand, or with a brass punch? Thank you very much for your help.