My new LYBAR

[yesyes]

Possibly get a small canvas bag and fill it with pea gravel and use that underneath it... or if you want to do it a bit lighter use polystyrene beads or buck wheat but they may crush down over time...

Peter....

One could strap that bag directly to one's rear instead of having 3 on the LYBAR; one for each height. That would also take care of the mud problem when rotating the contraption.