David Hearn wrote :
I have to re-attach a piece of plastic which is the pivot for 2 pieces of
plastic to hinge. It's like a plastic rivet. Unfortunately the top of the
'rivet' has come off (top is about 2cm across) and needs to be glued back
onto the shaft (about 1cm diameter tube, about 2-3mm of material).

What would be the best glue to do this, considering that it is under quite a
bit of stress when the 2 arms are flexed?

Glueing plastics never works well. I'm struggling to understand the
description of part your are trying to glue anyway.

I find I have some success by hot riviting small broken plastic parts.
For smaller parts I use ordinary paper staples, bent so provide the
reinforcement needed, then pushed into the plastic with an hot
soldering iron.

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Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.org