I have managed to do the job without removing the glass!
I had to remove the butterfly which attches through a hole in the glass, loosen the main centre bar which attaches the window to the butterfly, loosen the bottom bolts on the two window runners to allow more space for the glass to drop down in to the bottom of the door. If you don't loosen the runners, and the main centre bar there isn't enough room for the glass to pass between the door and the runners to drop far enough down to the bottom of the door.
The biggest problem encountered was the corrosion in the screws holding the seal on (well the three centre ones).
Ref the postage. I happened to be on holiday in Devon which is why I chose them to supply it, otherwise the postage (because of the odd shape) would have been £16.00 and thats in the UK! I just hoped they'd let me on the plane home with it.....in case they thought it could have been used as a weapon
Screws are now on order from Bell & Colville, special order from Lotus, arriving with me late next week.....£7.20 all in inc postage for 10.
there are also a row of pre-drilled holes in the inner door moulding, directly in line with each screw - why do you need a specail tool? Is this to do the job without taking the inner trim panel off?
Hope this helps?