Saw them also. If you like the oar lock concept, other options exist with any oar. I bought "Power Pull" oar locks from Don Hill in 96 for my cataracts. Not sure if he still is in business? But the tight fit and efficient roll sure makes them nice. Rick Johnson RIP, sold an original style at his Kalama shop for Willie back in the 80's. My bro still has them on his boat. Tried to get them from the machinist who made them but was cost prohibitive for one pair.
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"Life moves pretty fast. If you don't stop and look around once in a while, you could miss it.” – Ferris Bueller.
Don't let the old man in!
"Hilight it, Daylight it, Mack it out"