What I have is a shovel head harley with the 5/16 exhaust stud hole stripped out. I believe there is enough material there to install a heli coil but not sure if a time sert would work do to maybe not enough material there to drill and tap. I know a key sert is to big on the OD to work. My question is what is the out side diameter of the drill for the time sert. Or is there any thing else that would work? Thanks in advance.