Jim, I called the S&W phone number you provided. Spoke with a rep. concerning the cylinder recall and she requested the Serial No. I gave her purchased new date with serial no., had me hold while she checked if was within suspected revolvers sold. Next told a prepaid label would be sent, and to enclose a note inside box was for the cyl. recall. Given her name, extension - after providing my ship address with email & phone number. She said they would test the cylinder and notify before returning my 624. Do you think I need to follow up that telephone conversation with an email to them, before I FedEx my 624 to S&W. I'll skip buying a 44Mag cylinder at this point, would only trust S&W to do the conversion(something I was told might be possible, shortly after I bought it new in June 1985). Will be glad if it is determined safe and to get it back after it is tested. It is one of my favorite handguns of many presently.