Schulers don't utilize a weight bolt. They have a weight system that uses washers and O-rings under the bumper. The O-rings are compressed by the screw that holds the bumper in place.
Paul,
Do they use a pin in the A-Joint?
If so, I have seen a possible remedy suggested here in the past, a tiny hole drilled into the side of the cue at the spot of the rattle down to the pin, and then injected with epoxy via a syringe - I have never done this, so let the buyer beware!!
My 2 cents,
Gary