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Pfaff 438 bird nesting on thick fabric

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When sewing through more than six layers of 9oz dacron I'm getting top thread bird nesting on the bottom. It does not happen every time but when it does it continues for the entire stitch. 

It acts like the top tension is too loose and perhaps that is the case. Maybe the thickness is putting to much drag for the tension arm to draw the thread tight. I have decreased the bobbin tension and maxed out the upper tension but it still on occasion will nest. The odd thing is if it is gonna do it it does it right from the start. So far it has not started doing it halfway through a stitch.

Well as always thanks for your advice.


I should add I'm using a 20 gauge needle with 92 thread

Edited by Josacraw

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