That's a decent-quality machine (the kind of thing I like
) .
If you aren't interested in working on your machine (you mean you want to make stuff, not just fix old machines???
) then best to find a capable mechanic - not that easy in some places.
I'd recommend you spend the $100 when you can to get it serviced
by somebody who knows what they are doing.
I agree 100% with 'Thumbs' that it is not a (bobbin hook) timing issue, and if the 'mechanic' says that the machine 'needs the timing adjusted', make sure you get an explanation - there's bobbin hook timing, feed dog timing, etc..
Classic 'hook timing' symptoms are dropped stitches, especially on one side of a zig-zag in forward or reverse. (Remember, the machine is
always sewing in the 'same direction' ; it's only the fabric feed that is reversed by the feed dog mechanism. So if a machine will form stitches in forward, it will usually form stitches in reverse as well, IME.)
My first guess: something in the feed dog linkage/reverse linkage gummed up with old lubricant.
2nd guess: adjustment in feed dog/shift/reverse lever mechanism.
I have a Husqvarna (same company as Viking) and that machine has an adjustment to make sure that the forward and reverse stitches are the same length. BTW, on my Husqvarna, that adjustment isn't anywhere near the bobbin case!
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