Shorten Cable Needles

I saw on here once how to shorten cable needles and it named a specific glue. does anyone remember or can some one tell me how to shorten a set of cable needles.

Personally, I don’t know about this, but I’m curious to know what you’re trying to do? Are you trying to knit a small piece in the round? If so, have you considered knitting with two circs or magic loop knitting?

no i need a 24" and i have an extra 48" i would like to make 24"

Here is a thread where people have discussed this before:
http://www.knittinghelp.com/forum/showthread.php?t=74673&highlight=shorten+options