Has any one here messed with a 904 with both front and rear oil pumps ?

The rear oil pump cover needs to be aligned with a special tool (C-3762), it look's like it is a bit picky to get this right, when you put back to extension housing the outputs shaft makes a lot of resistance when rotating it, I removed the housing and loosend the oil pump cover and tried to align it a little better and this time the output shaft rotates a little easier but it is still not as it was before, so the question is, any ideas on how to get this right ?

If any one is interested I will answer my own question.

Use a piece of cardboard, 0.013" thick, wrap it around the guvernor support without the rings installed and use that to center the oil pump cover.