Ok guys, my girlfriend has a 05 Dyna with the 88ci (platinum finish motor) and the rear cylinder head spark plug threads are shot! Can't run a thread chaser the threads are too boogered up. My question is do I use a insert (heli-coil) or have a machine shop re-do it? Or any other suggestions or ideas would be greatly appreciated! Its been up on the lift for a week now, and she's getting a little...we'll you know!