@Formidilosus,
-As someone who likes fire... not like that... your reliance on natural fibers resonates.
-I have the same jetboil from the same era, with a horrifying amount of use on it. The o-ring that seals the canister/stove mating surface just gave up the ghost during use which resulted in a fireball. Jetboil went through different o-ring sizes with the different generations, and finding a parts kit for the Gen 1 is not a thing that I could reliably source. I ended up buying these:
3642N13 from M-Carr. They work, but are thinner than OEM. Durability to be determined. I recommend having one in your spares bag. There is another o-ring internal to the stove valve, I haven't dealt with that one yet.
-That anorak puffer looks good, please pass data when able.