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The closest I’ve been able to get to it is to submerge the arms in hot (nearly boiling) water for a bit, and then make the adjustment. It’s not quite as effective, but depending on what the frames are made out of it can do the job in a pinch.
Hm at what temperature do the lenses melt?
https://www.wikipedia.org/wiki/Polycarbonate
Probably ~130C but I would not gamble on this. I have no experience in lenses like this or their specific plastic composition. I just know most are based on polycarbonate, have made my own corrective reading, and my own anaglyph, glasses.
my lenses didn't melt but I have definitely fucked up the coating by walking into a sauna for just a minute which is very far below 100c