This is a you tube channel I'm going to be spending a bit of time on.
I've recently learned to properly oil my machine and have even put a reminder in my calendar so I can do it every three months. (except the bobbin race, that one I was told should be done every couple of bobbins). So given I'm still have a few issues with my tension this video, although intended to educate Longarm users, still has given me plenty of info to try out on my mid arm (Brother PQ1500).
I would be interested to know if this rule for bobbin tension applies to everyday sewing on my multi-stitch machine or if its just for situations when you're trying to do freemotion quilting.
Either way I'm sure you'll take something from what this quilting guru has to offer.