I saw reference to these being available at Aldi for the bargain price of £3.99 Link & details below. I have just been & bought 2 from Aldi in Bridlington. Maybe a little heavy for SOTA, but great for other portable operations.
Use for clothes dryer, gazebo, parasols and more.
Length: approx. 58cm
Diameter can be reduced from 63mm down to 26mm
5 reduction sockets - approx. 25, 38, 42, 50 and 55mm
Turning bar to turn the screw into the ground