There is two tops to a TDI pump. the tippy top cover is easy to do. The next one down is just as easy but garrantied you'll need to do the "hammer mod " to readjust the quantity. You'll also need VagCom to do that as well. IIRC, taping to the drivers side increases and taping to the passengers side decreases quantity. Its been a while sence my last one, so it could be the other way.