I sent S&W an e mail yesterday about your statement concerning the 624 cylinder and I got an answer this morning. They are sending me a shipping label and insurance to send it back.
OUT STANDING S&W
Not giving you a hard time but a word of caution is in order. If they find the cylinder is in the range of the bad ones they will keep the gun and offer you a voucher for something else. They have no more stainless 44 Special cylinders. A guy on the S&W Forum sent his 624 in and lost it this way. He was pretty up-set but S&W would not return the gun (lawyers & liability).
Dave