if the plastic pc. is sliding into the stainless pc. snuggly.. I'd hit the contacting surfaces with some fine sandpaper then assemble what you're doing, use Zap-a-Gap pink(thin) with the tiny applicator inside the cap and drop it in till it works it's way between the surfaces to be glued, hit it with a bit of accelerator and you'll be solid and the job will be neat...if there's wiggle room use Zap green and accelerator....my two cents...good luck...
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