This is the ruffler attached to my featherweight.
The attachment
[ATTACH=CONFIG]233153[/ATTACH]
Your fabric that is NOT to be ruffled goes completely under the foot
[ATTACH=CONFIG]233154[/ATTACH]
The piece to be ruffled goes under the blade, but over the plate above the bottom fabric.
[ATTACH=CONFIG]233155[/ATTACH]
It ruffles and attaches to foundation fabric at the same time...
[ATTACH=CONFIG]233156[/ATTACH]