Im doing a 73 briggs 5hp for the build off an I got a question I know I need the 1" 5/16 bolt to hold clutch on engine only problem is my crankshaft isn't tapped with thread for a bolt can I just use the set screws on the max torque clutch to hold in place or do I got to get the crank drilled an tapped to use the 5/16 bolt an if so do I gotta dismantle engine I really dont have time to take motor all apart or the extra money need it for the rest of the build off any suggestions thanks..ut: