more heat... that's what is needed...
if you are really worried about the stress that incorrect taper causes then maybe you could heat up your brass barbs so that they "warm" the plastic up enough to relieve the stress...
this temp would prolly be right below melting and if you go to far... toasted poly top...
of course the ammount and duration of heat will determine if you destroy your poly top, relieve residual stress, or do nothing...
This idea comes from experience molding lexan with a lighter...
Tokamac
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