End shake is something that can be corrected by the installation of the correct shim, something I would expect would cost under 50 dollars if you have a gunsmith do the work.

As for the rotational play, by design the S&W revolver is intended to be a Combat Revolver and one aspect of that use is that the revolver must still function properly after being dropped in a muddy trench. As a result no S&W revolver was ever made to be "bank vault tight", they should in fact have as much as about 1/32 inch of play in full lockup. It's one reason why these revolvers have a Forcing Cone in the barrel. Because it uses the bullet engaging into the barrel to bring the cylinder into alignment.

In summation I think you should count yourself lucky for finding this revolver and have the End Shake corrected while learning to accept that a properly functioning S&W revolver is supposed to have some play in the cylinder at full lockup.