I was inspired by Brewing TV's how-to's on cask conditioned ales, so I decided to give it a shot on a scale appropriate for my needs. I had an old 5L Warsteiner mini-keg sitting on a shelf so I inspected it for potential use. It has a plastic bung on one head that comes complete with a hard spile. I can vent the cask by pressing sideways on the spile, this is how you'd normally let air in as you draw from the keg. It has a spigot on the side of the keg, about 1" above the other head. This is positioned perfectly to let me draw brew without pulling the yeast, gelatin and hops from the very bottom. Plus the spigot is made where you pull it out but you still have to turn it to open the tap so it won't push out from the pressure of carbonation.
In any case, I had a small batch of Best Bitter done so last night I put together my cask. First I put some boiled priming sugar solution (I used 25g of jaggery, a kind of brown sugar from India), then I racked the beer into the keg nearly to the top, then added a little gelatin in solution, then a few First Gold hop pellets. I bunged and rolled and shook it gently. I put the keg in the kitchen so it would be relatively warm and carbonate quickly. Now comes the hard part, waiting! I'll check back in when I tap and see how it worked, though I see no reason why this won't go exactly as planned.