My homemade magnetic connectors were not as reliable as I would have liked - current transfer was intermittent and unpredictable.
I had a few trial runs with stripped wire ends as a method for achieving electrical contact, these were no more reliable! I also considered buying some sprung contacts online...
However, inspiration struck - in the form of a set of cheap wire and brass cleaning brushes!
After a swift encounter with a pair of pliers I had removed three se