Try this...http://www.network54.com/Forum/275684/message/1177168737/sheridan+C9+rebuildpv
there is a special tool for getting the valve out of these.They run 10 - 20 bucks depending in where you get it from.Bryan and asc sells them pretty cheap.They work well.Did the kit you got have a lead gasket or was it other material?The lead is the best for sealing the valve.You need any help give me a shout as i have done one recently and i believe i took pics along the way.