End-fly extender pole fittings for Jayco Expanda caravan

Early versions of the Jayco Expanda or similar have drop-down bed-ends, covered by canvas shade flys. These flys are supported by vertical poles that need to be pegged down for support. On concrete pad sites it is not possible to peg down the middle vertical pole, resulting in it just flapping in the breeze.

This Thing comprises two three parts: a captive lock anchor for the 'pin' end of a horizontal telescopic extension pole, the horizontal extension pole (which you can buy from a camping