who can repair my bell & howell model 245BA 8mm movie projector?

My Bell & Howell model 245BA will not frame the film as it goes forward. It seems ok in reverse. It is an auto load model and seem to load ok but will not allow me to adjust the framing of the film. Please help me find someone somewhere that can see if the projector is worth fixing or not. It is in nice clean shape and has been working great for many years. Please help me as soon as possible. Thank you