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get a cheap angle grinder from bunnings ($15 - $20) and get a a flexovit ultra thin cut off wheel 1mm thick 102mm wide. you should quite happily cut your sections out initially by a plunge cut and then moving it across etc.
I hope to have mike peltier cooler finished this weekend, and have noticed the effect of any heat (however small) on high mag work.
I believe any "constantly on" heat source would play havoc. a short blast of heat and air (hair dryer) buggas the seeing for about 10 minutes, but clears the mirror and then everything equalises out again
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