: I'm really glad I posted my question; now thanks to everyone's good ideas,
: I've got a couple things to try. I'm going to try the contact cement
: first, and if I end up having to epoxy, I've got a plan in terms of
: removing the varnish. Thanks to all.

I once tried using contact cement to glue something to a varnished surface. The varnish wrinkled and created an uneven surface. Apparently varnish and contact cement can be incompatible. Now I use Marine Goop for similar situations without any problems.

Glen in Baie-St-Paul.