Traditional Rowlocks/Oarlocks/Crutches for classic rowing boats.
Verging on the realm of gizmos, but these two patterns have stood the test of time.
Top sockets for rowlocks.
If you think people might borrow your oars on a semi-permanent basis, you could use this oar clamp to secure them to the thwart. That will make the whole boat worth nicking.
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