Rodney , That lever that travels at the top of the stitch width knob, gently try to take it to the right past all the numbers. if it goes all the way down to the right, pull the whole shebang straight out and there's where the cams go. If the lever won't move past the numbers than it doesn't take cams. That's the only way to tell the difference.
Cari
And if you email me I'll send you a PDF of the 280 manual, that's as close as you're gonna get. About 6 years ago Brother International told me that they never made a 271 or 281 model sewing machine.
Last edited by Cari-in-Oly; 08-01-2015 at 06:07 PM.