The rubber grommet is going on the end of the 6" long stock stem
I've had about 7-8 straight sessions before without having the upper 3-4" of the stem not even get hot, so I don't think it'll be too much of an issue
For it to be an issue, the glass would have to be hot enough to transfer that heat over to the rubber grommet, which will then release fumes and somehow be drawn into the bubbler for me to inhale
In other words, it won't get hot enough, if even warm, to produce any problems
I haven't even tried it yet, will know after 4 hours or so after my class, exam, run to the storage unit, and quick session to see how it works. I might even give it a shot before my exam, depends on traffic really
The Solo milks the hell out of my 12" straight tube with no effort, and thats simply taking my stock stem and shoving it in the hole where my 14mm GonG bowl goes, and it works perfect with no adapters/grommets/etc
Trying to use a smaller diffused bubbler (8") to make it easier to carry, but the seal sucks as its not GonG, and just a regular bowl
Will find out how it works in about 5 hours