on the SINGER 301A i use 16 which is 16 stitches per inch
on the BERNINA 1630 i use 2.5
on the Bernette 55 i use 2.4 except it is banished to the rolling case right now because it acted up last time
the serger is at default with tensions at 5
have a great sewing saturday everyone and anyone in the area or wanting a trip remember the Glendale Quilt Guild show is only a month away March 16,17,18 ..... classes start on the 15th check it out online