What is the correct location for this o-ring (r/t classic valve)?

I'm not sure if this reg seat o-ring is supposed to be placed in the brass reg seat holder, or in the recess of the rear half of the valve. Pls see pics.

http://i971.photobucket.com/albums/a...psd4ec5567.jpg

I've been placing it in the brass reg seat because that's where it was located when I disassembled it for the very first time, however...
http://i971.photobucket.com/albums/a...ps711f5d51.jpg

...it keeps ending up here after a few shots.
http://i971.photobucket.com/albums/a...psd6ca3810.jpg

Does it belong in the rear half of the valve?

Is it leaking ?

It goes in the back of the valve

in the reg body, but it'll move. make sure it is clean and well-oiled.

Quote:

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Originally Posted by OPBN

Is it leaking ?

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Nope, no leaking issues.

Quote:

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Originally Posted by Tunaman

It goes in the back of the valve

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Thanks! That is exactly what I needed to know.

Quote:

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Originally Posted by Cyco-Dude

in the reg body, but it'll move. make sure it is clean and well-oiled.

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That's what confused me, as I didn't expect it to move. Thanks for the advice:)