hi I in thr process of putting in my new injectors... but as dumb as this sounds the copper washer seems to have a thicker lip on one side than the other. does it have to go a certain way? Also the injectors can twist a touch in the hole even with the hold down there but not tight. if it isn't exact wont it make the seal on the return lines hard to go together flush u know??? I just want it to go together..... once lol