aight, you need more than a pocket multi tool allen wrench. you need something a little heftier, something a little bit longer. i have absolutely no intention of trying to put on or remove my stronglight cranks (well, just crank now since i bent the nds) with a pocket, folding allen wrench. but luckily, i do have a nice bit fat long one, and it does the job.

fyi, they're called self extracting crankbolts. you tigten them, and it pulls the crank on to the square tapered bottom bracket spindle. when you loosen, it pulls them off. for other types of cranks, you need a crank puller, which threads on to the crank, and then threads on to itself to push the cranks off the spindle.

self extracting crankbolts are the cool.