HeliCoil.. pronounced HEELY Coil, is a kit actaully,it contains little springy things (inserts). You Ream-Out or over drill the hole. You use a "tap" that comes in the kit that's over-size thread on it's outside and the same as your pedal spindle thread on the inserts INSIDE.Nuff said, easy to figure out. The size you need is 9/16 " YES inches NOT metric, lucky that way, it has a "pitch" called SAE or Fine thread, NOT the most common,not an odd-ball either. Parts stores have it.If the parts store seems confused or seems to wanna make YOU feel odd, find another store. I used and sold SO many, I kept them within fast reach.