I wonder if anyone out there can tell me if the elevating roof mechanism I have is any good. I am renovating a 79 Holdsworth van and have never seem this type of lifting mechanism before. It was all dismantled when I bought "Lottie" and I therefore do not know how effective the mechanism is. At each end of the GRP roof there are a pair of arms pivoting on brackets mounted on the roof center-line outside the canvas and the upper ends of the arms have plastic attachments that slide in alloy tracks attached to the underside of the pop top. The weight is counter balanced by 2 pairs of scroll spring mounted on the base bracket. Some piccies of the roof and arms: Grateful for any comments if you have ever come across this arrangement.