Assuming its a singer domestic machine
1.For a 1 step buttonhole, you will need to place and lock the actual button at the buttonhole foot holder(back end of the foot), the size will remain the same each time you sew a button hole.
2.For a 4 step buttonhole, the size is determine by sliding the foot against the line/marker which you can see on the foot itself each time you start to sew the button hole.
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It is a Pfaff 2040
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