My dad's old light tripod is great for shooting slow film with my baby MF speed, but the head keeps unscrewing from its base, when we pivot it counter clockwise for a shot. We have tried to repair physically with lock washers ect, stays on longer, but still comes off.
So was thinking of using some elmer's glue or is there something else that is better, that would allow the head still be detached, if needed?
elmer’s would probably work. A thread locking compound like “Locktite” or similar is more suited to the application. If you go that route, make sure you use one labeled as “medium” strength. The permanent variety requires heat for removal. Just a couple of drops is all you need, a little goes a long way.
Locktite 242 Blue thread locker. Apply a drop to the threads then install the bolt/head and tighten.
Other brands are likely as good as they use the same number and color.
242 Blue breaks at 40 inch pounds of torque, using more such as coating the full tread makes it more difficult to remove. Allow to cure for 30 minutes to an hour prior to use.
Another approach would be to drill and tap from the bottom and use a set screw into the base of the tripod head. Might want to do two or three set screws.
Also try cleaning the threads of the attaching screw and the camera with lighter fluid or acetone to remove any oil or grease. May keep the camera from slipping. And in any case, will help the Loctite adhere. Do not use red Locktite - it is made for 'permanent' use. Well, so is the blue, in a sense.