The knives were removed during dis-assembly for the safety benefit of the timing of the loopers. Everything went fine with three threads and the needle; then four threads with two needles. She was satisfied with near-perfect stitch patterns. But when the knives were re-installed, everything went haywire! See attached picture. Do you have any advice at this point?
Also, she needs to know what lubricant to use with a metal gear meshing with a nylon looper gear in the gearbox. She removed the old grease from the gears and applied the Singer gear lubricant temporarily. By comparison, it seems to be too light a lubricant to replace the heavier grease.
