Not to beat a dead horse, but I really like Big Jim's hot melt over the hardware store types I've used. The glue really has to flow down into all the crevices of the insert. To do that with the usual hot melt, I have to get the insert way too hot for my carbon shaft. Big Jim's low temp glue melts and flows at a very low temp. I have no fear of weakening the carbon shaft and it seems to remain both sticky and flexible much better than anything else I've tried. I want to see the insert completely covered, especially the rear, and all the grooves, knurling, whatever is used on the insert to provide a mechanical grip, completely filled. That way, when it is inserted, there is complete glue contact with the shaft and insert. The temp is so low, I can touch the insert or shaft immediately after insertion and it is not overly hot.