This isn't to really debate what the guys drilling out to 7/64" are achiving because their clouds kind of speak for themselves.
However I wanted to point out a couple things from the internal aspect. This is a clone....I'm working on getting specs and pics of the inside of an authentic TGT, because I see no need to take mine apart. That and I don't think the authentic TGT will be a lot different.
Once you get the air tube and bushing out and drill out the side air hole to 7/64" there is still some limiting factors. Again this is a FT clone, but there is an angled hole in the chamber base that goes to the air tube hole, this is ~5/64". However look at the second pic with the disk installed, it looks to restrict even more.
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How about beveling that side of the disk a bit to improve the airflow? Shouldn't hurt it at all
Sent from Gallifrey using a Sonic Screwdriver via Tardis #5 :what: