Salutations,
I'd like to see them sold with a 2nd "puck", and why not a spacer too - as i'll provide my own tubing!...
Bronze but short would be great, e.g. a metal version of the wooden classic will do just fine actually. I can't tell if that works with a genuine VG since i've modified mine (and look forward for a 4th transformation), but i've started using my pipe in various ways (normal/standard vertical pipe fashion, horizontal side-lightning - which is my method with PVC tubing), etc.
Essentially there are 2 modes:
a) Capture heated air from around the flame
{...my front "Puck" doesn't have to get particularily red...}
b) Turn the (front) "foamy rock" red (~4 sec.) then remove fire while still inhaling (2-4 sec.)
{..more focus on amount vs duration required while heating, also OKay with a blue torch...}
Mode "a)" can be performed without a PVC tubing extension as that's the original way. Mode "b)" probably depends on the fact that my front "Ceramic Filter" is thin and hence easier to redden than a standard VG version. Mine fits with a slightly thicker "puck" near the bowl and a spacer in between (which may become a counter-measure effective against "hot-spots" if lucky)... Anyway, i think mode "b)" helps to reduce fuel consuption and a blue torch flame would only make that better i believe; it also tends to be somewhat more spicy, that is why i appear to require direct eye-contact on the front "Ceramic Filter" (provided through my PVC extension tube).
In both modes i feel having a "2-Stones" configuration is a real improvement and then this is how i come to wish the manufacturer would extend his offer to include kits, perhaps...