Fixing 2m Tonna Dipole with Polymorph

What is Polymorph? Polymorph’s full name is Polycaprolactone which is basically a mouldable plastic when heated, normally in warm water. The problem I had, which seems to be a common one, is the threads for the thumb-screw which holds the driven element to the boom on the 2m 17 element Tonna used by G3PYE/P had