All of this you say makes sense however I'm headed in the direction of Claes 30 machine due to its bigger bobin, larger needles and I think needle advance? I'm setting-
up shop to do a wide swath of leather work including some industrial lifting strap sewing and joining.
I'm thinking based on what I know, the Claes can be used in a variety of situations including some operations of bag making. The Claes machine has needle