Was/broken plate bolt

[Ron Nossaman]

>People use varnish not only to assist driving the pins, but also so the
>tuning pins will be tighter when it dries.  Don't know as I'd try it in
>this application when there's soap or beeswax, or the screws may be
>impossible to remove by next tech -- or by you if you forget something
>along the way.
>
>Wally Wilson

But the varnish isn't to tighten the pins. It's to assist driving, like you
say, but it is also to smooth turning during tuning. It won't glue the
screw in any more than it will the tuning pin. Paste wax works ok too with
plate screws, or bees wax, or old candles, or nose grease, or McLube, or
probably mayonnaise, though I haven't found it necessary to try that one.
Almost anything that won't screw up the wood (no pun intended), and won't
migrate unnecessarily, yet will supply some lubrication while the screw is
being inserted should work just fine. 

 
Ron N