Honestly I've used mine (prototype) quite roughly since I've had it and I've never see that. I've had a crack on the wood really early but that's it. (And it's not expanding).I just found this review about the vapman click. The author states that on his Vapman Click, 2 of the 3 "pressings" are loose and the tubes are rattling. He also shows athis picture where the tubes burned into the wood.
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As i`ve never read anything like that on FC, i wonder if he got a faulty unit or simply used the Vapman completely wrong? I guess this won`t be the Case with the Mica shield?
For the record, with the ruby it runs hotter than usual : require significantly more heat and stay hotter for a longer period of time. And even with the ruby and extra heat, nothing like that.
I wonder what torch was used with this one...