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jon, there is a needle retainer, but it sits on top of the needle head. i would imagine that if it is already shimmed and you pulled out the needle, the washers may fall off.
i believe you would be able to tell by just looking down into the hole if there are washers on the needle. if they did, maybe you could add another shim. if they didn't then you could do the mod.
if the washers do fall off when you are trying to remove the needle, you could try tweezers. or a magnetic pick-up wand (still dying to use mine for something). you could actually remove that whole diaphragm part, but it seems really fragile and i would be afraid to tear it.
anyways, good luck.
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