| Luckily (maybe) the Brass Eagle Nightmare cupseal is actually a disc. If you can get in there ( you need to remove at least three grub screws.. they are small and need an allen wrench for removal.. then the valve should slide out) you can flip the cupseal around.
But I have a feeling that in the process you are probably going to munge up an oring or two... Unfortunately no one makes these specifically for paintball anymore, but you might be able to find replacements at a good hardware store.
And yes there are a few people here that can walk you through disassembly.... but you probably won't have to post anywhere else.. they will probably see it here.
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Gone fishing
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