I wanted to pass on a method I used to fix my handheld Garmin GPS 76
that might be useful for similar units. One of the push buttons had
come out meaning that I could no longer access that function without
pushing something into the unit to press the membrane pad where the
switch had been. I squirted a little 3m5200 into the hole to form a
new "button" and it is just flexible enough to form a good button for
pressing the membrane AND it re-seals the unit to make it waterproof
again.