did you get one of these CGE push/pull pots?...
http://www.wdmusic.co.uk/product/POT_PUSH_PULL_500K_W%7CDPDT_SWITCH_WD500PP# only tried those pots once and they were shitee, very loose and cheap feeling - not much cheaper than CTS either.
you could try these guys (Fake58)...
http://www.fake58.co.uk/G%20electrics.htm their PRS upgrade kit includes two 500k push/pull pots. their stuff is typically very high quality, I've certainly been happy with my purchases from them.
or you could see if CTS would sell you a single pot directly, you want the '041' switch type which is a SPDT push-on, push-off. you'll want the 450-series pots which is what you typically get for guitar pots. these will be full-size CTS pots too, not those mini-pot POS things.