Debbie,
The characters: "W654321N"on the side of the button holler are the width controls. W = wide, N = narrow and the numbers = in between.
That button holler is not for a Singer or Singer type, but it's for a Kenmore, White or other machine that uses the collar type of foot attachments. You remove the collar assembly then attach the button holler with a wedge fit on the round shaft using the screw to clamp it tight.
The large plate in pic 12 on your blog is the feed dog cover plate and it goes with the button holler. There should be a thumb screw with it as well.
I have an old Kenmore that uses that style.
The button holler works the same, just attaches different.
I'll go look at the other pics on your blog now.
Joe
Last edited by J Miller; 03-29-2012 at 06:05 AM.