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You have to take the domes off and remove the pistons. There's a set screw through the side of the piston that holds the needle in place. Undo that and pull the needle out. The letters are stamped on the surface that the set screw contacts.
If the needle doesn't want to come out, try wearing rubber dishwashing gloves to get a better grip on it. When you put it back in, note that it doesn't push all the way into the piston, but that the bottom of the mounting surface is even with the bottom of the piston.
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