Perhaps this helps, see page 3 http://dixiesewingmachine.tzo.com/MANUALS/PFAFFSERVICE/245-1245(11-88.pdf
or
http://www.schmetzneedles.com/learning/pdf/industrial-needle-chart.pdf page 72
I've just finished a top for a m3a1 halftrack, up to 9 layers army canvas.
I used a needle with a round tip. I wouldn't use a leather type needle for this material.
Hi Najram,
I bought mine here:
http://www.andrevowebshop.nl/a-16711785/bies-uitvoering-wf9335/dekplaat-91-040894-21-im/
It is a reproduction, I can't find a brand on it.
I have a similar machine with a 1500 W 7 Nm motor, limit values
and 550W 1,2 Nm, rated values.
I bought my parts at www.college-sewing.co.uk . they have feet for the 867
Hi, I use in mine 467 needle system 134-35
I noticed that with thick materials a R-point is better than a LL or LR-point.
Because of the asymmetry of the LL or LR-points it moves in the material to one side
and hits the feed dog.