solution is dont follow the instructions on the sheet ... look at the way the door is assembled on the web site for getting it right way round..fit the top bar and screw in loosely..then squeeze a glazing sheet in and work your way down..i dont think the glazing is quite the right size mind has bowed a bit on a couple of sheets but seems to be working its way in... fitting the door took some working out...slide the rail right across "to the left on mine" then slide the runners in and slide the rail back... have u figured out how to lock down the opening window... hope this helps...ready to put the tomatoes in this weekend