Our friend Zig Paul at Cabriolet Hydraulics came up with a replacement cap that eliminates leaks of the reservoir due to pressurization when in use. This is an improvement over the non-vented sealing plug. This cap does not drool or dribble, but vents of the pressure through a neat little oil separator in the cap. Zig purchases the vented caps from a European supplier and then manufactures the exact interface to fit the reservoir on the SSR.
I have been testing one of these on my own SSR. It gets a regular workout, since my SSR is the final quality test platform for the Roof Door Module. After 2 years and several hundred roof cycles, the cap and tank are still clean on the outside.
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