I don't know if anyone's messed around with this - certainly my 504 is a slightly ODD setup...! I have a tablemount model which I mounted to the wall -and whose table I removed... leaving me with the tablemount configuration for neg and light stage positioning intact. I set it up this way so I can project murals onto the floor. I have a breakaway table I built for normal projection distances - so - basically - this leaves my focus system sort of incompatible with what I have set up. Focussing with my magnifier on the floor is hellish - since I have to re-insert the focus rods and reach wayyyy up with my arm while my face is at the floor. SO - this being said... anyone have any great ideas about some sort of permanent system that may work for me...? A motorized transport would obviously be one solution - but a solution that would require WAY more involvement than I'm prepared to expend.... How does the wall mount devere do it's focussing...? Maybe I should try to get some parts from that one. Otherwise - maybe a flex-shaft approach might be the way to go... anybody try this - or try replacing the normal shafts with anything 'alternate'...?