OK, now, on the left side of the shroud, there is a little silver button to push to release, and screw out the firing pin.
My PH just wrote me, and lost his "button" and spring.
Is such a thing available? Pre 64 M 70 or will newered ones work as well?

Jim Wisner can probably get you fixed-up right away.
Take a look here:

http://www.wisnersinc.com/explodedviews/Winc70_pre64.htm

That "button" would be your sleeve lock.

I wouldn't be surprised if Jim isn't making those...They're not the easiest part in the world to machine. The factory originals are either a MIM'd part or investment casted...can't remember which.

Brownells maybe where you'd want to look.

Thanks, Wisners had them in stock.

Terry

Be careful if you intend to ship that part out of the U.S. Many countries consider any gun part the same as a whole firearm.

Ray

Thanks for the tip, it never fails to be something.