I just finished disassembling/cleaning/lubricating/re-assmebling a used Toyo 45A. My front focus lock was a tad loose, too. Tightening that lock is no big deal. You do have to remove the plastic bottom of the camera. There are 3 set screws hidden under the ring of leather that surrounds the tripod screw. You have to carefully pry up the leather ring (it is glued down), then remove the 3 set screws. The rest of the plastic bottom is just held down with rubber cement. Carefully pry it up too. Once you have the bottom cover off, the friction lock adjustment is obvious.

(Don't try this on a Copal shutter, though...)

Doug