So now that I'm home I got a chance to try the stem mount. I didn't have as much luck as JRD. I'll photo document so that other people can see what I did.     Slipping a razor under the cap. Once it lifted a little I went to a straight blade screwdriver. It's a round plug in a hex hole. No twisting needed.       So following JRD I used a short piece of vacuum line. Just the right size to fit in the hole. Note that the included nut is JUST the right size to fit the hex. Also don't lo