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The top of the needle is machined into the profile of it, as a result there is no slop from a C clip, but you have to use a spacer shim under them...
Had to fiddle with the shims under the needles on it anyway. As you can see down there is a slight groove machined into the slide for the O-Ring...
I have a CB400SF, same carbs as MC22. There is a small spring on the inside of the retainer, It clips into place at the bottom of the slide above...