I used 2mm stringers inside some 44x4. I used some 32mm medium wall on the inside. My worry was that the small stringer lines would not retain definition when pulled down but they did.
Definitely not a prodo tech as it is more time intensive to stack inside the tube, and doesn't yield poundage. Probably step up to 50x5 or maybe 60x5 next and see if it still looks good. Just another fun way to get some lines in a tube.
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