After reading your post Roland, I'm beginning to think machines just must
be different. We have never used anything but NEB bobbins (plastic sided)
and in the nearly 3 years we have been sewing on our machine(s), I can count
on one hand the times I have had to adjust our bobbin for tension. Our
machine sews best with a bit tighter bobbin tension--it takes a snap of the
wrist and it falls slightly.
As for the cleaning, we check it by running a business card corner under
it and in 3 years have actually found something under it once---maybe twice.
Not using the cardboard sided bobbins seems to be our saving grace. With
the plastic there is no lint. When we did find something, it was a very
tiny piece of thread. If we see bobbin coming up to the top we just
increase the material thickness until it stops. Bobbin adjustment just
doesn't seem to be an issue--we set it and forget it.
Sharon