sl 320

Hi there, im new to this forum can anyone give me a reason why my soft top only opens half way

Hi - I am new to the forum. I am about to buy an SL320 W129 (1997). Can't wait. I am looking for a car cover. My main concern is to keep out the moisture/wet as it will be parked on the drive/street. I have had problems with E class of the same period (W124) rusting on the wings/arches after...