if you can afford to upgrade to the 6700 - or to one of the horizon series with accufeed - i encourage you to do so.
as to the non-AF/DF quarter-inch feet, look online for the O2 foot.
you can barely see the physical difference between the O and the O2, but they don't perform equally.
the O2 handles bulky seams much more easily than does the O.
the O2 also has the guide and can be found online for under $15US.
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