Loose Crank Arm Problem

http://www.londonfgss.com/thread23425.html

Tighten the bolts (with a resonable amount of force, but I would'nt 'put my weight into it'). Ride the bike a few times and retighten. The cranks work their way up the taper after a couple of rides because of the torque on the bolts.

Tighten the fuck out of that bolt, then get someone who knows what they are doing to have a look at it just in-case.

The quote I found then was good. :)
http://www.londonfgss.com/post742009-11.html