I did not see the OP as being a heat issue, just a mechanical mounting
issue... THough toroids are more self shielding than than non toroids,
they are not perfect... Based on my experience with toroids in VFO's
being very close to a metal object does affect the inductance, I would
prefer to see him glue an insulator pad to the heat sink as a spacer
and then glue the toroid to that... IF he was in fact trying to
heatsink the toroid, he has major design problems he needs to solve..

denny / k8do