Found the problem (s) with
Viking stuck on backstitch!!!
Two problems:
A: machine is "gummed-up" form old grease.
Solution: degrease machine with a high quality degreaser.. I used a spray electrical degreaser from an automotive store. Turn the machine up-side-down to preform this!
Then relubricate machine. Use a high quality sweing machine lubricant! Also lubricate the inner parts with a qigh quality "Sewing machine" oil.
B: Found that the return spring from foreward to backward was tired.
Soultion: Replace with slightly stronger spring from local hardware store.
If you need pictures, I took very detailed pictures of the reverse mechanism and "return to forward" spring.
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