Singer Tucker

The manual for the 503 has this to say about the tucker:

"Since the beauty of tucking lies in explicit accuracy, the Tucker will contribute greatly to the attractiveness of this work. 

Tucks up to 1" may be stitched and marked in one operation.

Two adjustable scales are provided to gauge the tuck width and spacing.

Use either straight or decorative stitch setting."

Singer made two different slant shank tuckers. The first is part number 160692, the singer tucker made for class 301 machines.

Mine is a lovely blackside tucker. Here it is:

Since the 301 was a straight stitch machine, the hole for the needle on this tucker is only set up for a straight stitch so you can't do zig zag tucks or change your needle position when using it. 

The second slant shank tucker is part number 161226. Mine has a copyright of 1962 in the instructions. It was made for zig zag machines so the hole for the needle is wider, allowing you to zigzag or change your needle position. 

Here it is:

I haven't done much with either of these attachments but I had to have them for my collection.