RON PARRISH Yes, I use 19mm casing on my 1/2" tube and have to stretch them out
I had some 17mm casings I was able to fit on the 1/2" tube but it was enough of a struggle I won’t do it again

PapaSop Yes, flare up plus. The top air flow control does not close all the way and since the tube was directly in the intake cylinder I had a runaway. I’m going to see if I can modify the top air flow control.

Never noticed, yes, way better