The driver's window on my 1992 Ducato based camper needs to be looked at, but I can't get the window winder handle off, or the surround for the door handle. I'm sure that there will be a spring clip or something behind the winder handle, but I'm having working out how it comes off. Likewise the door handle surround - no visible screw - how does it come off, (without breaking it). Thanks in advance for any help.