SpudFiles

Lol, ive used pencil erasers as pistons before, they work decent but they will fail quickly when your barrel eventually pushes through the soft rubber.

SpudBlaster15 wrote:Cyanoacrylate adhesive will work fine. I've used it to bond sealing faces to pistons that are too small to accept a bolt and washer, and I have never had a failure, even at 400PSI in a T valve design.

Is that just a fancy word for super glue?

Sort of... not all super glue may be cyanoacrylate, and not all cyanoacralate adhesives are super glue.

So, in a word, yes.

Cool, if that is the way to go then I guess I'll pick some up. The face on my piston is neoprene, cut out from a rubber washer. Should this be strong enough?

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Superglue is a brand name much like Pepsi is for a caffinated cola soft drink. There are other colas besides Pepsi, but the formulation varies a bit between brands. The same is true for Superglue and other cyanoacrlate glues.