Hello so my folding roof opens and closes only partially alone, I already built the engine apart and replaced the plastic gear wheel with a brass wheel. The roof just creaks thinking that gear wheel what the Bowden train is skipping this, only what now do..? I have already greased everything with the hand pushed back and forth several times and oiled the Bowden trains. Can one renew the Bowden train or replace it? Did already want the gear wheel what goes on the Bowden trains something apply so that it does not jump so easily only seems to be nitrated and thus can not be welded. What else does anyone have an idea…? Thanks in advance