(should have said bobbin washers....duh)

Have any of you used these specifically in a class 66 machine which has a drop in bobbin and if so were the results good. If you do use a 66 to free motion on would you mind sharing the particular foot you use.

The reason I ask is because I have a sewing class room equipped with mainly 66's and some 99's. I would like the gals to practice free motion and it would be easier for me to use the 66 machines with them.

I usually free motion on my 15-91 and I have an old industrial singer I use for really big stuff but to teach I would like to use the 66's since they are set up so close together.
Thanks in advance, Gwen

they made a zero difference for me in my quilting - with or without them the quilting looked exactly the same.

I like to use them myself!

I have had NO need for them in the 12 plus machines I own. Technique and practice is everything. If it ain't broke, don't fix it.

I have a singer with drop in bobbin. They didn't fit. Pushed bobbin too much wouldn't shut. Haven't tried on 15-91

I use them in all of my vertical bobbin machines - the difference in the stitching on the backs of my quilts is incredible, whether I'm using a 15-91 or a Kenmore from the 50's or one from the 70's - they're just like little miracles.

They don't go into any of the machines I own with horizontal bobbins, though - 66, 201, 401, 500 - nor do they go into the 301.