hi there,
you mean bobbin tension,on figure shown
there is set up screw on the body latch of bobbins
if you can see,use small flat screw driver adjust gradually not to tight then insert thread have it pull this should be on trial and error bases because there is no numerical figure to indicate,mostly this was factory adjusted have you ever watch sewing on
www.youtube.com try it type this on you internet address,then on you tube search box type
"sewing machine"there are set up slide on sewing machine intruction,have a nice day to you and don't forget to rate me thank's
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