I've tried Odyssey, bought the manual etc. but I'm still having no joy. I have a free standing 504 and in order to get it in the house had to dismantle the base board and the base board stand. This meant that the chains in the drop bed base became disconnected from the lens and neg stage focussing wheels. I've put the chains back in what appears to be a logical order but there's just too much play. Does anyone have a floor standing unit that can have a look at the way the chain is threaded through the various cogs and wheels. The only details in the manual are for the cables in the actual column not the chains in the base.