By all means rebush the keys.  It is not a recommended procedure to
turn the front rail key pins.  Is the side play coming from the front
rail pin bushings or the center rail bushings?

If you have never done this key rebuilding procedure then contact Bill
Spurlock, Spurlock Specialty Tools, at <spurlock@spurlocktools.com>
He can give you information on the best way to do them and has the
supplies to do the job.

And a very Merry Christmas to all of you also.

Clarence Zeches, Toccoa, Georgia