Justed (torture) tested out some this morning on a 30 target course. 2" of lap (but a little different story for me as I use an additional 2" to lengthen my arrow, and a cut piece of carbon shaft riding between my full length shaft and the aluminum insert). Glued up with Powerbond. I lost one in a repaired foam target - that repair material is brutal.... and bulged one on a steel drum - thanks Brent for putting that image in my head. I use 2216's on Heritage 250's. My prep work may have not have been stellar on these. I usually like GoatTuff for my glueing. I don't like the "mess" of JB Weld.