Originally Posted by
k9dancer
3. We who work on machines have not seen this one. Is it possible there is an issue you have missed?
If you mean we haven't seen the machine in person, or a photo, agreed.
My initial interpretation of this comment was that the people on the board that fix machines are not familiar with it. Not so.
I can also post a how to on how to disassemble and adjust the needle tensioner back to factory specs. That may fix your tension issues. Otherwise, somewhere here I posted how to disassemble and clean the bobbin case spring. It was for a featherweight, but the principle is the same. That's all (and probably more than) a lot of the repair shops would do. It's standard when I service, because I don't want to see the machine back, but I know one repair shop that bragged to me that they spend 10-15 mins on a service.
I don't think that's something to be proud of personally.