I have a ruger 45 acp cylinder that I have used in my OMV ruger. As best as I can measure 1.84 in at the part where the base pin goes through to the star on the back of the cylinder. And 1.71 in the length of the cylinder portion that holds the shell. Here are some pictures. Thanks Bullett
If you have replaced the lever spring put a washer behind the spring and try it. It only takes a few minutes. If not then you have a problem with the interface of the locking lug. Bullett