Contact S&W for an owners manual. Too long to reproduce here.
If you don't have a manual, you will need a good gunsmith
The original manufacture of the Iver Johnson Model 55 Target pistol maybe able to provide an owners manual. The manual will have instructions on what is need to maintain the product.
Which model? The best thing to do it check the owners manual.
it is a Model 39-2 9mm pistol
Check the Beretta website.
If you are looking for the owners manual you can find it at the link below.
where can I purchase an owners manual for a Milbro G10 Air Pistol
YOu need a gunsmith or call S&W and ask for a owners manual
Call S&W, want ad, on line auction.
Go the S&W website and request one.
You must follow the instructions in the owners manual or call S&W