I believe Michael will be contacting you privately. However, is photo accessed via the link where the problem is?
<The problem stems from the brass track system the rear standard rides in. There has been enough wear to allow some wiggle that I would prefer were not there. Here is a photo showing the pieces in question. This is the right side, the left side is simply a mirror image.
These two parts either need to be replaced NOS, recreated altogether, or new brass needs to be brazed on to the existing parts and then milled back to shape.