Re: what did you do to your motor bike today? http://www.nuttycyclist.co.uk/cycling/photos/chain-hook.jpg http://www.nuttycyclist.co.uk/cycling/changing_chain.htm Mount the derailer first, then before attaching the chain, run it through the derailer: go over the freewheel/cassette, over the top of top der. cog, through the guards on the cages, around the bottom of the bottom cog. Start with the chain going around the biggest cassette cog, and biggest chain ring, to make sure you have enough length so it doesn't bind up. You can use a wide U shaped hook made from an old spoke, through links about 4-5 inches apart, to keep the two links together where you are joining them.