So got the top and bottom shafts sync'd and the hook timed. My issue is that there was now a noticeable catch after the hook makes the loop with the top thread. Right as the loop is drawn up to create the "knot" nearest the needle, the loop is not rolling off the hook smoothly - it would make almost a light snapping sound and a jerking movement up at the controller spring forcing the spring to act twice. Weird. The ultimate result is that it isn't breaking threads any more but now the symptom is that no amount of top thread tension will create a balanced stitch - the bottom thread is straight under the fabric and every top thread loop is visible - no matter the tension settings. I did have the hook out and had to adjust the end play at the gear as it was setting too deep and was dragging underneath.
Any ideas if this is an obvious sign of something?
Sorry, Tom, I hope I am augmenting your adjustment questions rather than hijacking.
Dave