What exactly are you planning on doing with your Seneca 9? If I am not mistaken, it's one of those selfcasing cycle cameras, and approaching about 100years in age. Are you looking for a "cosmetic" repair for display only, or something a little more serious to put the camera back into service (in which case the already mentioned R.R. would be a good choice)?
Honestly, I wouldn't recommend using these cameras for regular shooting other than maybe the odd photo during a Sunday afternoon drive. They are rather fragile to begin with (the insides, not the box itself), especially the triple extension models like your no 9.