engsol wrote:
I need to mount an ON-OFF-MOM bilge switch on my power panel.

The Rule has a "kit", which requires sawing a rectangular hole in the
panel to clear the switch body.

When I was a pup, I seem to recall toggle switches which had an
extra long threaded barrel for thicker panels.

Know of a source? Bet Larry or Bruce does..

Thanks,
Norm B

If it's only one switch, you could use a brace and bit or a router to cut a
round recess
first, then chisel out the recess to suit the length of the thread.