[jakeru]

Now, clean all the dirty surfaces that rub against other surfaces, and lubricate them.

I recommend using a plastic-safe grease here, such as silicone or PFPE grease (DuPont Krytox is a brand name of PFPE oil and grease.) There are two coaxial coil springs, which I managed to lubricate without complete assembly. I found one dry part of the inner spring that needed lube in the picture shown. (Basically, you'll want to make it so the springs rotate smoothly and without stiction or noise.)