Just wondered if the locking bolt on a SS mod. 65 is fitted or a drop-in part? I purchased an almost brand-new 65 that sat in a drawer for years but the cylinder rotation is stiff. I've lubed the heck out of it but inspection looks like someone took a file to the locking bolt and it's filed off center. Looks like it is binding the ejector rod. So do I have to send the gun back to S&W or just get a drop-in part from Brownells?