I was once shown "The best way" to get the glass out by a hack-job MC mechanic.
Step one is to make up an adapter to go from the metric thread for the lines to an airline fitting.
Step two is to apply 180 psi to the master, and watch as the whole thing explodes into 14 and a half pieces.
Step three is to say it must have been faulty, and order a new master.
I do not recommend this procedure for anyone, anywhere, anytime.
I have only replaced sight glasses that were cracked, and they came out with a little light prying and minimal clean-up. I suppose once you strip out all of the internals from the master, you could heat the part to expand the metal, then pop the glass out with a push from behind with an allen key.
Hope this helps,
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