All I ever use when gluing the tubes in the wood blanks is Gorilla Brand Super Glue, which is "rubberized." I had used others when first starting, and had too many blow-outs. In nearly 200 pens, I have had 3 blowouts, and that was my fault for straying away from my norm of three beads on 7mm tubes, and 4 beads on larger diameter tubes.