thank you very much for the input.
frankly i dont see the plastic cover. any chance to point an arrow to it?
and now that we are at it, any chance to enlighten us about that mysterious Schrader valve?what does it do?

and just when i thought i knew all that i needed to run this car (notice: all that i needed, not that i know all. far from that).
thanks again. great pic, by the way.
and forgot: whats the test port? to test what?