you can buy a jig to drill the heads of any 6 pt bolt you want, i think mark williams sells one too, then you can drill and saftey wire all the bolts on your car, and if at all possible use a nylock nut, on the aircraft there is usually triple redundancy, in the form of a friction nut, spring lock pawl and saftey wire/cotter pin, and we never have a bolt shake loose, and if a chinook cannot chake it loose, nothing can.
Grant