In reply to The Pylon King:
> ... its stating that I find the idea of jamming concrete to be a really depressing idea...
Give it a try. An actual bridge with pigeon shit and human piss is not very appealing, but the indoor version is great!
My office in our 1970s concrete and asbestos university palace has the floors divided by groups of four concrete pillars to make changing floor plans using movable walls really easy. The good bit is that every room therefore has several 3.5m high offwidth splitters exactly 14cm wide.
Too narrow for my knees, unfortunately, but my foot and calf jams and hand/fist stacks have become perfect over the last three years!
Recently I challenged a student who is climbing sports competitions several degrees harder than I could ever dream of to climb the "crack" in the tea room without laybacking, and it spat him right out...
Ha, 1:0 for the old guys!
CB