Attempted the SEARCH function with little success. My Sub2000 (the new version, "Mk 2"?) 40 S&W had a loose stock collar, part number 148 in the exploded diagram. Went to the disassembly pdf on the FAQ post and it refers to using a strap wrench to loosen it: mine has no threads? I could twist it (snug it up or loosen) by hand. Please advise: I've put a couple boxes of factory fmj range ammo through it, everything functioned normally, but NO THREADS where collar attaches as shown in the pdf illustrations. Thanks in advance for your kind consideration.