Gluing plastics - tips?

I have an adjustable "sleeve" with telescoping inner sleeve. It locks in p lace with a beefy plastic clip that has pins that push down into holes into the sleeve. Picture a plastic 3/4 circle about 1.5" in diameter (like a C with the open ing downwards). The pins stick down inside the C and insert from the outer to inner sleeve to lock it in place. The shape of the C allows it to push up and down on the outer sleeve for easy adjustment.
Anyways, the top of the C has fatigued from too many adjustments, and crack ed. So I am thinking about adding another "layer" of plastic, cutting a pi ece of PVC pipe or something to fit snugly over the smaller clip, and gluin g it in place. In other words, a slightly bigger C fitted over the smaller C.
So, (finally) here is my question. The smaller C is a hard black plastic, I can't determine exactly what type it is. The larger C would need to be s omething already in the right shape, like a 1" length of 1 3/4" plastic pip e.
I want the glue the outer ring onto the inner ring. Without knowing the ex act plastics, is there a prep/glue/product that will A) be strong and perma nent, B) work generically on varying plastics, C) allow for the C to flex a nd push down on the sleeve, and D) be waterproof (the sleeve is actually a windsurfing boom arm).
Thanks for any assistance!
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Plastic is always difficult. Can't picture your setup. I always consider using plumbers goop, or specifically, marine goop. It's tough, flexible, etc. It also runs as applied. It might take a week to fully setup, but it's the strongest I know of, without cracking.
Greg
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On 12/29/2014 11:04 PM, gwandsh wrote:

Short answer -- NO
Styrene based plastics need a glue with a ketone based solvent.
Some will hold with epoxy.
Some will not work at all with any adhesive but can be heat welded by softening both parts and sticking them together.
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