I did a couple of videos on request. Thread upper tension seems to be the limiting factor on thread size. Industrial machines have multiple tension dials to sew heavy. I got more tension with a double wrap.
Thanks!! I have 135 bonded poly ordered from thread exchange and size 20 organ needles. I’ll have to try the same thing when my thread comes in.
Much appreciate you trying this and sharing the videos from, I presume, my request. Thx!