I took out the bobbin, cleaned that area, oiled it, put in a new needle and wiped down the case...wow...it sounds so contented...it hums nicely as I stitch along.
I know I don't change needles often enough.
I think I'll fill a few bobbins with neutral thread now. It's always nice to have one ready when you run out as you are trying to finish something.
It's a new year - does your machine need a new needle and a bit of TLC?