I was sewing some webbing recently, and my Elna was doing just fine, whizzing through the work (a bit too quickly…). I used the reverser, and hand-turned the machine for a few stitches, after which everything went rather stiff, and the motor struggled to turn the mechanism, even without any material under the needle.
I've removed the shuttle, etc, but the mechanism is still very stiff.
Does anyone have any suggestions as to what might have gone wrong, or useful service guides? The manual for the machine doesn't mention this problem in its troubleshooting section…
It's an Elna 2000 or 3000 model, circa hmmm… 1998, although it's not had a huge amount of use over the years (the occasional outdoor projects, and a best man's waistcoat…)
I'm suspicious that something has slipped in the mechanism alignment.
Thanks in advance.

