I threaded this 1897 machine with blue thread and the new electric machine with black so I could work between the two devices. Though my foot kept tapping about for the pedal on the old one.
Winding thread on the bobbin is an exercise in engineering.
I focused so much on winding the bobbin I forgot how to put it back in the machine.
Lucky I had the 105 year old instruction manual handy.
While I was at it, I changed needles.