The SOHC/4 World Tour is in under way.
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The solid threaded things I've used are "keenserts".They work very well if you have the room to install them, the outer threads are fairly large. I've never seen one fail like a helicoil will, although in severe use they wear out; these are commonly used as original parts on camera equipment etc. made of aluminum whaere mounting bolts are going to be used often. Aluminum threads wear quickly and are very easy to crossthread a steel bolt into.