I haven't seen it elsewhere, works great, so thought I would share
cut off an aluminum crutch I bought at a garage sale
used two rubber stoppers and pounded them in on the end
cut a chunk out of a car tire and screwed it on, that expanded the plugs so they are tight
voila, easy chain lubing or tire changing, and the height is adjustable
p.s. I can never figure out putting up photos on forums, the sizing always messes me up