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Rally is right, do yourself a favor and search through the CF threads; lots of great info. Getting them off is much harder than getting them back on IMO. One thing to watch for that bit me is when you are putting the caps back on, be very careful not to dislodge any of the needle bearings. I was finishing my last one and while tapping the caps on, 3-4 needles came loose; I couldn't figure out why the caps would not go on all the way. I pulled it a part and found I had broke 3-4 bearings. Just go slow and check and double check. Man, I hate replacing brand new parts -- it wasn't the first time and it won't be the last time, but it always hurts.
Don't use a hammer or air hammer to get them out, you will bend the flanges and put the axial out of balance. I would have them pressed in and out at a shop that can also balance the shafts afterwards. While you already them out... not that much$$$ Vibration is a B@$#
I cleaned up the bores with a sanding drum on my dremmel tool to remove all corrosion and get shiny metal on 100% of the bore, then warmed them up a bit with a torch. I used the jaws of my 6" bench vise as a press and smoothly pressed them together. No hammers. It dislodges the needles.