Buttonhole pfaff 7570

SOURCE: how do I put the buttonhole attachment on my pfaff

The part with the metal that has the little holes in it will slide in from the back just under the stich plate. Push that all the way in and it will spring out about a mm. And the other part is just the presser foot, put in on just like a normal foot.
hope this helps

SOURCE: pfaff 2170 will not make consistently sized buttonholes

Go to the following site regarding timing your machine. Are you placing a button in the buttonhole foot so the machine "knows" how long to make the buttonhole? If you have a button stop lever to the left of your needle bar, are you pulling it down and putting it in FRONT of the button stop so it can complete the rotation?
Try www.fixsewingmachine.com
Try http://www.manualowl.com

SOURCE: Buttonhole feature

try changing the needle
make sure the button hole lever is pulled down, it should be on the left
hand side of the needle, if your machine has one
it's also possible that the machine needs to be checked to see if
there is something wrong with a gear or just needs some type of
adjust inside of the machine