so this is kind of a long shot, but does anyone know what size bolt goes in the cap of the starter solenoid? My solenoid wiggles a lot and there is what looks like a bolt hole on the passenger side that is empty, consequently I had to hold the cap on to start my car this morning. ok thanks

forgot the engine stuff, SBC 350, th350 trans, its a stock replacement starter. I don't know how many tooth flywheel it is.