I just got a new White Speedylock 1600 and got it threaded, and cannot figure out the tension! It looks like the left needle thread is too loose, and either the upper looper thread is too tight or the lower is too loose. ?? But i've adjusted the left needle as tight as it will go and it still looks VERY loose. I can get the loopers to match up on the edge, mostly, but all of the thread just looks too loose! Any help would be much appreciated!