I have a 64 Skylark Convertible (first ever vert). The car has been in storage for a few years and when I hooked up power to the switch, the top slowly came up and stopped about 3 inches from reaching the top of the windshield. At that point it seemed the hydraulic rams were straining. When I unzipped my rear window, the top completed its cycle and all was good. Does this seem like the hydraulics might be a little weak? There are no leaks in the system.