The bolt (1/2" SAE fine thread) that holds the harmonic balancer on my 427 has stripped out about half the threads. I installed a longer bolt to get into some new threads but fear I'm bottomed out and not clamping the balancer tight. Is there an oversize threaded bolt or am I going to have to pull the engine to repair this? Ideas? I've thought of installing a stud until it bottoms out and then use a nut and washer to pull the damper down tight. Has anyone ever come across a good repair for this problem?