Hello. I recently purchased a cobra class 18. It sewed for a solid minute until it did not. The tension is off it seems? I’m using 140 needle with a 207 thread, sewing on 5oz leather. I’ve done more tinkering/diagnosing than actual sewing and feeling a bit down and out at the moment. The needle goes down a few time, then the thread begins to come apart then bunch and breaks.
What’s happening? Help?