Check that the aerial (pole) is up all the way, also tension setting on the thread. I would expect the needle tension to be 5. now review yr threading , check this thread from cone to needle and see if the thread is wrapped twice around a loop or catching on another guide or just missing a guide. sometimes if you put pole down to cover machine at night, then come back and pull up the pole for next use, the thread may catch on back thread support, around the cone or foam under cones. its usually something simple. also chech the take up lever, is the thread passing under this?? if not that would cause breakage just as it does with regular sewing machine. the take up lever draws thread down when needles raise to keep thread feeding to needles - maybe this isnt happening? if its definitely threaded correctly try stitching very slowly and see if take up is moving??? lastly is the thread old brittle and dry?? although most locker cones are poly thread they can get brittle if very old. good idea to store the spares in a drawer long term out if daylight if you can. and cover machine up when not in use, plastic panels are adverse to sunlight and ditto for the thread. hope some of the above solves yr problem. but if you cant resolve it then take for a service, should have one every two years to clean lube and reset looper timings to get best from the machine.
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