zero cost .. no parts to buy
When the side of the saddle hits my hip bone, standing next to the bike,
it's good enough.


upper section of telescopic seat post like all those mountain bikes, can be stolen.
as there is nothing keeping it ..
I had ideas about an interior cable to the top of the second section,
fitted to the rubber plug, sold by Brompton.. at the bottom,
there is a screw and wedge in the Bung..