Mini Blocksetter Crane
This model appeared in Constructor Quarterly in 2022, and has been slightly altered in my version. The crane is hand-operated and replicates four motions: slew through 360°, travelling, crab travel along the top rails, and hoisting.
The turntable is built using a Märklin 2½” diameter ball race, dating from the 1980s threaded Meccano thread, as I could not see how the Constructor Quarterly version was built up. There was another version of this model shown by the builder Ron Frith at the 2022 Hainault Hangout.
In the future it is proposed to rebuild the model as a monotower or hammerhead crane, like the one preserved in Glasgow.