These are 2 pages scanned from the instruction booklet that comes with the PS 150 Selector
This was originally designed
to be used with the Singer 150 Bulky machine which is a 9mm machine.
But...I have used it with my Brother 230 machine
Also it is designed to use 12 stitch punchcards, but 24 stitch punchcards will roll through it too, but it only selects
every other hole so many punchcards will produce very different patterns, all you can do is examine them and try the patterns
It functions very much like the Jac 40's.
You can punch your own cards for this using regular 24 stitch punchcard
blanks, they will work just fine, just punch every other hole.