As the others have stated you want to push the firing pin in fully while pressing the FP safety plunger in & you'll notice if you release the plunger while the FP is fully depressed that it will catch on the safety, then with the ambi safety lever removed, If it has one, you can manipulate the safety lever about half way in between fire & safe & start to wiggle it out being ever so carefull not to loose the safety lever detent & spring, A large clear freezer bag can be used to capture the small parts if you disassemble it inside the bag, a little tricky but worth the hastle if you loose the parts.. #4 & #5 are tiny..
Once the safety lever, spring & detent are removed you retain the Firing pin with your thumb & press the FP safety plunger & the Firing pin & it's spring will be released.
Reverse on installation, You may have to push the FP in slightly to get the safety reinstalled, then when the hole for the plunger & spring is close to the slide you install them & work the safety the rest of the way in working it inbetween safe & fire.. easier said than done but not too bad..
On my 3913 there was some crud in the firing pin channel & I hosed it out with Gun Scrubber & a pipe cleaner + 22 bore brush, I also put one drop of oil on the safety & detent but you wanna keep the FP channel dry/clean.. Do not over lubricate this area.. You could also use a Tetra grease or TW-25B white grease sparingly..
I put an extra power Wolff FP return spring in mine as it came with a new recoil spring kit that I had aquired..
I also noticed that my safety was smoother to operate after this as there was a bit of caked carbon & oil lube on the safety & plungers..
Please anyone trying this use the freezer bag & if your not mechanicaly inclined take it to a gunsmith PLEASE!!
I had no trouble but was taking my time & looked hard at the parts diagram beforehand to assist me..
I'm Not a Gunsmith & Never Claimed to Be..
Gary/Hk
