These may be incorporated into other Whimseys such as chains
Slip Joint in as-carved position
Slip Joint in the opened position
Balls-in-Cages are often incorporated into chains to add interest
Swivels are always a good idea
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The puzzle above is relatively simple to construct; this is a pressed or forced assembly evident by the chamfered hole and inserted section. Often one end of the insert is soaked in water to aid in assembly.
The two puzzles below, while based upon the same concept as above, are not simple pressed assemblies. The shoulders are exceptionally large adding to the mystery of assembly. My "guess" is the insert was either boiled, or soaked in a mixture of water and alcohol; then compressed, inserted, reconstituted and dried.
(but that is only a guess)
An Anchor is a common addition
This is something I carve when I have to wait somewhere; all it requires is a 2x2x6" Block and a sharp pocket knife.