The video below shows an updated mechanism for a gravity powered motor like the one shown in an earlier log entry. In the new version, the diameter of the cog is 1.5 times larger to give greater leverage, and it is mounted on a steel shaft (part of a tent peg) rather than plastic to reduce friction. The escapement mechanism is more loosely fitting to prevent it from jamming. It feels lighter to operate. Now I need to make a beefier solenoid and attach it.