How often do you (should you) use your secondary machines?
I just realized recently that I've been sewing exclusively on one machine for quite awhile. It's been over three years since I touched one of my older ones. I think I'm only keeping it for sentimental reasons! Even my Featherweight has been idled since COVID has kept me from retreats and traveling. How often do you alternate? Should I make a project on each of my backups to keep them in shape?