Are the bearings loose? (Like a wheel with the cones not tight enough? Can you move the FW with your hand with the wheel stationary? (Either side to side or tilting?) If this is happening, perhaps you can adjust the bearings. I've never worked on a Shimano FW and it has been 45 years since I did a SunTour so I have no idea if you can adjust the bearings or how you do it. Possibly you can back off the outside face and tighten the body or maybe there is a thin washer that can be removed or another added.

Edit: pastorbob beat me to it AND he knows Shimano FWs. Go to his post.

Ben