I have extensive experience with older and antique machines. I didn't work much on the new computerized machines. I worked with a fabric store chain MINNESOTA FABRICS until the owners retired, I repaired several hundred machines in fabric stores in Minnesota and Wisconsin where the sewing machines really get a real workout during the winter months. I tried to start a shop here in the Dallas metro, in 1999 but couldn't make a go of it. I really loved the hands on work and loved the praise and appreciation from the the customers. It was a "Clean Oil and Adjust" service while you shopped. $9.95 +tax. Repairs were for same day next week if i needed to order parts from Brewer Sewing Machine parts in Dallas' Texas. I made round of all the fabric store round of the company included in Minnesota , Wisconsin and Indiana.
I want to buy them but don't think I can. You might try on offer up or you could try Mr. Sewing on Harry Hines blvd. I'm sure they know where you can get a good price for them.
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