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I use marine grease on my splines, I believe there is a ridge in the center of the pump so you load the bearings from each side until they get to the stop at least that is what I recall from years ago doing those pumps ,so do not try to push both out the same way as you will damage the ridge in the housing. Since using a combination of grease and gear oil I have not needed to rebuild any of my pumps , oddly I have a new set sitting here in the box for over 2 years just in case I need them. I use high heat silicon gasket maker between the pump halves but it has been a long time since I built any pumps as I said.
I just had this issue with my 2022 255 FSH. Spent the better part of today trying to get the shaft out. Your technique was definitely helpful after all other methods failed.