Thank you for the video. I watched quite a few of them. I want to hem long sleeve T-shirts and I haven't seen that demo'd, just woven items which are easy. I'll keep watching.
I am not having trouble threading it, as I said. The trouble is the speed. There is no speed control, that is why I'm having trouble slowing it down, if there was I'd be all set. It's a manual, as I think most coverstitch only machines are. The sewers in the videos seem to sew a few stitches and then stop, adjust the fabric, then sew a few more, so they never get going. I may return the machine and just hem with my sewing machine. The coverstitch has limited uses.
Thank you again for your help.