Happy belated birthday! Those machines are way cool! I know at one of the shops I go to they have a new book you can buy that has lots of things about it.
I am pretty sure if you check around you are going to find someone to spruce them up.
I have my mom's fifties singer portable. I just had it out the other day looking to see what it needs to be able to use it. Hubby said there was a man he deals with that does the servicing. So... I am going to have him do it. I found some of the old time bobbins at hancock fabrics a couple days ago. 12.50 for a blister pack of them. I used my 40 percent off coupon and went ahead and got them.
Did you get all the attachments? These oldies were really great to have tons of the nice feet come with them.