A second bobbin case is ideal when you want to set the tension tighter or looser for specialty threads. Bobbin Case, Viking Husqvarna #4011530
Viking 7, 19E, 21, 21E, 49, 51, 52, 90, 95, 100, 105, 120, 150, 150E, 180, 185, 190, 940, 945, 950, 950S, 960, 980, 990, 990S, 1010, 1020, 1030, 1040, 1060, 1070, 3230, 3300, 3310 3320, 3610, 5230, 5430, 5530, 5540, 5570, 5610, 5710, 6010, 6020, 6030, 6170, 6230, 6240, 6260, 6270, 6360, 6370, 6430, 6440, 6460, 6470, 6570, 6690, old style models 610, 620, 630 - White 3200, 3500, 3900, 8410, 8910 Some models 100 and 105 classica with short post on hook, hook 4011521 must be ordered also - Alternative number 4114942, 4114962-01
Here's how to determine which shank machine you have:
Put
on your regular piecing foot and lower the foot. Using a tape measure,
measure the distance from the bottom of the foot to the top of the
screw hole that attaches the foot to your machine.
If the distance is 3/4" or less, you probably have a low shank machine.
If the distance is 1 1/4", chances are you have a high shank machine.
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