I've had decent luck with the Bohning Cool Blue. I have read where others weren't real impressed with it, but it's worked for me so far. Have heard a lot about the hot melt that Big Jim's sells and will probably eventually give it a try, the Cool Blue was just convenient because it's available locally. I think prepping both the shaft and insert prior to gluing is critical though. Rough up the inside of shaft with a copper bore brush, scuff up the insert with some sandpaper, clean both with 91% alcohol, and let both dry well before gluing.