Any rumours that this is for a boat tent are wide of the mark
Some time ago I made a pair of collapsible oars for my little gaffer and it occurs to me that 'Polly Wee' would benefit from a set as well, with flat blades and shortening to lie on the cockpit sole. Then my nethers wouldn't be sharing the side-decks with the current curve bladed eight footers:
Just as suggested Paulie, I used some stainless spring-a-buttons from an old windsurfer boom, but I've run out of extending booms now and I just hoped I might find an easier way than paying even second-hand commercial prices for a boom I don't need, or spending the time waiting and wandering off to the local monthly windsurfer jumble some miles away.
Graham's on-line answer seemed ideal so I ordered a double one (a half for each oar), only to become embroiled in an e-conversation with the seller about how they sometimes come to a disagreement with salt water, but he'd taken the money and sent them anyway