The power button on a Garmin 305 is covered by a thin rubber sheet that is part of the watch body. The sheet covers a small plug that goes inside the watch to contact a micro-switch. Over time the rubber deteriorates until the rubber plug falls out and the watch is exposed to rain, and the on/off has to be activated by a toothpick.
I have tried putting my own plug in place and covering it with a dollop of silicone, but that only lasts a few weeks before it peels off.
I would appreciate any suggestions for how I might hack some fix for the missing plug. Maybe a suggestion for something better than silicone to hold the plug in place (it has to be flexible enough to allow the plug to move down to activate the switch).
Thanks.