Hello. I've got a few questions on Ikonta disassembly. First is: how do you remove the winding knob? It has a screw at the top that doesn't seem to want to move. I don't want to force it and I suspect that the pins that hold the 'wings' on top of the winding knob is actually a single pin that goes through the screw itself and I need to remove the pin first. Second: middle element of the lens assembly. how do you remove it from the shutter? rear and the front unscrewed quite easily... Third, the bellows. It seemed that the bellows where attached to the back of the lens with just a threaded ring and no glue. Was there supposed to be glue and did it just dry out? Thank you.