I am new here, Don is my name.
Anyway, I have a long barreled Pietta '58. Took it apart for cleaning, deburing polishing and lube. Now, the cylinder won't lock (unless I push the hammer forward while cocking), and at half-cock, if I squeeze the trigger, the hammer will go to full cock, then fall.
I ordered some new guts for it before the project, but I have changed out every component one at a time, still no dice.
Now, I do have a new short barreled Pietta '58, too. Did the same thing, worked perfecty, silky smooth.
Also, the older '58's has a narrower cylinder bolt, with a narrower cyinder indents. Found that out, too.
Anyway, any help?