Great stress - the stitching wasn't good. So I googled it. Found this. I'll try again.
"When threading the sewing machine, the sewing thread spools should unwind in different directions in order to prevent the entanglement of the threads; i.e. one spool should unwind to the right, the other to the left. The threads should be threaded through all guiding elements, respecting separation elements above the needle; see also the manual of the machine manufacturer. Insert the needle into the needle bar as far as it will go. At first try the desired decorative stitch in the smallest width and then gradually increase the width of the stitch. If the upper thread is not optimally picked up, the needle can be minimally lowered - less than 1 mm. IMPORTANT: After that, turn the hand wheel carefully and carry out the first stitches manually. This avoids machine or needle damages. If there still is no optimal interlocking of both needle threads with the bobbin thread, the adjustment of the machine should be checked."
The stitches were skipped and uneven! To be fair to my old Bernina, it has taken a bashing from my grand-daughter as she battled with her textiles homework (lots of free motion onto dissolvable - you should have heard the machine groaning as it forced the needle through a thousand previous stitches). So I've put it in for service.
I'm going to try again tomorrow on my reserve Bernina - just have to scrape the dust off the case first as I haven't used it for a few years. It's about the same age as my old faithful but not such a large machine.