It's been ages since I've worked on one of those, so here are a couple of general suggestions.
Look at the back of the lens/shutter through the back of the camera. You might see screwheads that need tightening.
If not, you'll need to peel back the front leatherettes by the shutter-standard, which will reveal screws securing the standard and focus-assembly. Remove those, pull off the standard, and work your way into where screws have loosened.
Good luck,
Mark Overton