Double Helix has them on their website for theirs, and some of the other silver glass places have theirs too. I don't know of any one site with them all listed, maybe someone else has one.
For instance, Sky blue does not like reducing flames if you want it to stay blue, it will get red in it with too much propane (but you might like that, so can use to your advantage).
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My current "hot" fantasy involves a senior discount on glass & tools!
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