Last month I was doing a little maintenance on the tandem. The timing chain (the one that runs between the cranksets) was loose. This bike is outfitted with an eccentric bottom bracket to facilitate adjusting chain tension.
It appears that this style of EBB requires a special tool to rotate. Meh. I just used an allen wrench in one of the holes used for the special tool, and moved it against the crank for leverage.
Easy-peasy.
