Un-braze seatpost collar with handheld mapp gas torch?

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I realized that my 41 Rollfast has the seat post collar brazed on. Is it possible to melt it away with a handheld torch using mapp gas, or is that something that the average joe should leave to the LBS? THANKS!
seatpost.jpeg
 
Technically that could work, brass melts at about 900 something and map gas burns at 2900 something I wouldn't want to do it though. Chop shop customs has a seat post that fits in there that heat treated. I don't know what the advantage of removing that collar could be
 

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