Amazing thread! Thank you so much for all this information! I have been sewing on my various Singers for many years and I now have lots of tips on how to spiff them up and make them glow.
I wonder if any of you have tried to restore the cases for the portable Singer models? I went looking for replacement cases and found that they can cost more than the machine heads...YOW! I have 2 cases that need restoration. One is for my 1950s, Singer 403A...a trapezoid style that has lost its vinyl skin and is coming apart. The other case is for my 1955, 99K that is starting to show some fraying on the (varnished?) cloth skin, near the edges. Any ideas?