Maybe these guys know NOT to take off the spline nuts? I'll remind them. Its an Indy Mercedes only shop and they need the business. The owner is a friend of mine and he has done lots of little things and sold parts to me at discount for several years. Its time for him to make a little off of me. Your procedure sounds pretty straight-forward. I'm assuming that by NOT taking off the spline nuts the chances of getting the pump out of calibration are highly improved? Ernie