I brought out both our Singer ZZ attachments yesterday and tried them on our 201-2. It's one of those actually listed on the instructions.
Both attachments and the 6 different cams worked nicely. Much better than before. All of the patterns were narrow, but looked like they should.
Some time ago I tried the attachments on the HOTHER witch is a 15 clone and it didn't work worth a hoot. The regular ZZ pattern was narrow and ugly and the others couldn't be made to look nice.
Apparently even though the HOTHER is a 15 clone, it's just different enough that the ZZ attachments do not work right.
Being the glutton for punishment that I can be, I'm going to try the attachments on the HOTHER again, and on my FW.