Keep in mind that I am not a real bonafide marble maker, there are lots of people on here that know a ton more than I do.
I seriously doubt a single M20 is going to run the inner and outer on the Bravo and allow you to make 1.5"+ marbles in a timely fashion. I'd keep it just on the inner if all I had was the single M20. Well, I'd TRY to do both just to see the results, but I doubt it would do well running both inner and outer.
I have my M20 on the inner and tanked on the outer. I think that is a good compromise if you can't afford running tanked on both. Do most of the work with the inner and just turn on the outer when you really need to bathe it.
I think M20s go for $450+ new. I got mine as a scratch-n-dent special, so I don't know the normal price.
-BEP
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Brian E. Parker aka BEPNewt
Lifelong glass lover, now getting to work with it. Using a Bravo on an M20 & Natural Gas ( inner ), Tanked O2 & Propane ( outer ).
Grew up near
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