Question about PfaFF Sewing Machines
Firstly are you using a regular twin needle on a knit fabric? this could cause skipped stitches.
is the twin needle quite old and possibly blunt?
Is the Hobbymatic a model that requires a slanted twin needle, there are two types of twin needles as the computerised machines need the offset style. You can distinguish between them by the plastic block on the needle shaft where the twin needle points are set, either red or a deep brown colour.
If none of the above apply, then it is possible that the timing sequence is slightly off so that one of the needle's thread is not getting caught during the stitching.
Timing is an adjustment that I leave to the technician to address. But if you want to have a go yourself there may be some videos on you-tube for your model and how to make this adjustment to it.
Posted on Jun 19, 2011
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