If you search eBay for accessory sets for the 600 & 700 series of Touch & Sew machines, the black "top hat" cams will all work fine as will the slant-shank attachments that were originally included with those sets. (the white cams will not function correctly - they will not even seat properly in your 403)
The sets for the Touch & Sews sell for far less than the sets sold specifically for the 400 and 500 Slant-o-Matics.
I've seen very large sets of the black "top hat" disks with a lot of attachments and sometimes even buttonholers and other options sell for $10-20 plus postage, which will run about $12 via Flat Rate Priority mail. Many times, these sets don't even get a bid.
Get a box of q-tips and a bottle of acetone or denatured alcohol to clean the steel parts inside the machine, a bottle of Tri-Flow to oil it all and you have a wonderful hard-working machine for a pretty small investment.
