The citric acid you can get at many pool supply places. Or you can get it off Amazon.??
Larry, I think I have a couple pounds of it, that should last me a while...I got it off either Ebay or Amazon, can't remember, just that when I was looking for it the most common was homebrew supply shops.
Got a spot cleaned on the bench and got the input shaftless T5 face planted on the bench.
Then I used a magnet to remove the ball bearing.
Used an old Huck cylinder to support the case while I drove the pin out of the 5th/reverse fork.
Then I needed to go up and get some ring pliers, mine were too big.