It never ceases to amaze me, the things that can mess us up in the middle of working on a project.

Same here.

Umm I am a bit picky but my ladies so appreciate being able to do a basic maintenance service of their machines as local servicing is a bit thin on the ground locally, temperamental in service and EXPENSIVE. So much so although I am in North Wales I send mine all the way up to Scotland, hundreds of miles and a different country but IMO worthwhile!

So the more my ladies can do themselves the better, shame my computer expertise doesn't help with posh machines :)

Recently, my top thread was pulling down to the back of the quilt. I changed everything, cleaned, rethreaded, and finally turned the machine off and waited a while and went back to it later. It worked. I have always found it to be "operator error" in my case. LOL!!

I think that is great. And it sounds like you have given them the knowledge they need.

Probably a lot of problems are operator caused. Good that it got straightened out for you.

OMGsh! I've never thought about cleaning the tension slot. Thanks.

I hadn't either. But on another machine (front loading bobbin), I was having all kinds of stitch issues and just finally took a closer look at the bobbin case, where a tiny piece of a thread got caught in the slot. Fixed it.