has any1 done this mod cause i was lookin at guide on the net and it said u have to cut the metal ring out the nova rear wiper arm and put that in the fiesta arm but on my nova arm it dont seem to have a metal ring in it so wat they on bout so all i done was put a screw through the arm and wiper motor spline but when u use the wiper it dont return to the bottom it stays bout half way up has any1 else done it and whats the best way cheers