Homemade motorised trolley supported on a wire strung between two trees. One tree is solid the other bending with the breeeze causing the trolley to swing sdeiways as it approaches the end of the 20 meter run. The motor was a 20 RPM 12 vdc driving a small pulley system.
The Opsmo Pocket was suspended from the far from stable trolley, the changing weather and not wishing to disturb the nesting birds did not allow time to improve the balance this time around.
Setup cobbled from my "it will come in useful one day" junk box.