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I've posted a number of questions looking for training and advice as I have worked with this machine since April. The big guns here, and others, have kindly responded numerous times. I am grateful!! This 1956 year machine was in good shape mechanically as far as wear goes, but it has seen a lot of use, and from the slight buggering of the slots on most of the adjustment screws, several visits to shops or techs with ill- fitting screwdrivers have happened. I did get it sewing satisfactorily, yet was bothered by one issue - the upper thread check spring action was jerky, and actually appeared to have one semi-snag in the stitch cycle right when the upper thread was getting pulled past the gib plate. About then I posted a number of times on a thread focused on check spring action. Last night, I started from scratch with the hook removed and began the installation and timing process once more. I noted a couple things - my needle bar has no timing marks, and the slot on the needle bar screw was wallered out from many screwdrivers. Also, even though the two screws on the hook gear were different externally, one sort of rounded and the other flat on top, both were flat inside. I believe one should be pointed to stay in the groove on the hook shaft. I carefully went through the process. Last step was adjusting the case opener to allow the thread loop to pass as soon as it was pulled up to the opener finger. It stitched beautifully, smoother and quieter than ever, great top and bottom tension, check spring behaving like it should! Then, after about 18 inches of seam in two layer vinyl, it all went south. Something has moved or come slightly loose. First indicator was the top thread skipping a couple stitches. I ran out of time to investigate, but am confident I can pin it down. Those things I mentioned earlier are all suspect. Think I'll engrave my own timing marks on the needle bar, and pull the needle bar screw and work it over or replace it. I don't think it has decent bite. I want a pointed screw on the hook shaft gear also. The hook saddle clamps down fine. Need to make sure the big gear on the main shaft has proper screws and stays put as well. I have a new needle clamp and screw to install anyway. So knowing how it can do now, I'm hopeful I will get it back to that. To be continued.......