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I have a 1541s  juki that's been having problems since new,, i set the timing exactly how the book says,2.1 mm after bottom center in center of the needle, total needle bar length of 56.55 mm. needle about .001 away from needle ,, it cuts the bobbin thread off in reverse [lock stitch] plus unwinds the bobbin,, bobbin thread on correctly,,i've tried all thread tightness adjustments. help,,what am i doing wrong ??