For those like me, frustrated with the compression relief on-off switch/knob because when pushed in to release the compression, the damn thing sits sooo far down into the cowling that it takes a pick, screwdriver or long nails to reach in and pull it back up.....this is a quick and easy fix. Cheap, and takes all but two minutes to do - most of all, it works. These are automotive plastic vacuum plugs. Scuff up the decompression knob with a razor knife to give the glue something to hold onto....then glue and stick 'er on. My GZ5000, the white cap worked - the 7910, Black cap but had to use two, damn thing sat soo low in the cowling. Thought id share since it was P me O to dig the damn thing out every time.