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The Service Manual for the 134D does not provide tension info by grams unfortunately, however, there is a variation as you have discovered.... so, how do we do it ?Easy solution is to use 4 threads of different colours and adjust by eye to balance the stitch... once all looks good.... this is the killer... pull off each knob and reset to 3
Yup, that's it
I have thought of the gram method, as some manufacturers do offer this option, however, the eye test works well.
Just back the tensions off a little and bring each together... the needle stitches first, then the loopers seems to work best for me, and the different colours make it a breeze to ident the offender/s