Hey gang! I've got a pre-lock 64-5 and it has a tiny, very small amount of endshake. Barrel/cylinder gap is .006", Lockup and timing are perfectly fine but with the trigger held to the rear, there is a tiny perceivable amount of front and back play to the cylinder.

My questions:

A: Is this normal for a Model 64?

B: How does one measure endshake?

C: Are there "specs" for permissible endshake in a S&W Model 64 K-frame .38 special revolver?

D: If there should be absolutely 0 endshake, how do I go about correcting the issue? Is it user correctable or will I have to send it back to the Mothership?

Guys I am freaking the hell out over here, not sure what to do!! I also want to get some target grips for it but not if it'll shake itself to pieces in short order.

Please help!!