do you mean the actual reel seat is moving?? if so you can some times break the grip away from where it joins the reel seat, get some 24 hour araldite & squeeze it around & down under the reel seat, keep rod vertical so that glue runs down. you can try thinning with metho enough to make it runny, the metho will evaporate,& putting in a large syringe to make it a bit easier..
do both ends