Originally Posted by joshofalltrades
but my experience suggests that it can be installed properly by placing the top of the pump in place about 1/4" forward of its proper position, then sliding it back to where it belongs and installing the screws.
Yup; works fine. Just got to take a look at the lever and see where it should be compared to the springed-slidey-thing in the top of the pump, such that when the lever is pulled 'on' it doesn't interfere, and when it is off, it pushes against said slidey-thing. Easier done than said.