Tuning Any 342 re-seal tips from the experts?

Blew a seal in my Benjamin 342 today. I can hear air escaping in the tube after the first pump. Won't build up any pressure. Looking at doing a reseal. I'm fairly handy at taking things apart and putting them back together. Any advise from those who have done it would be greatly appreciated. 
 
You will need a valve removal tool and a rebuild kit. Remove the stock, trigger assembly and the two small screws that hold the rear plug in. Pull hammer and hammer spring to access valve. Insert tool into rear nut and turn out. Screw valve tool onto valve assemble and wiggle or slide hammer assembly out. Clean everything well. That's the outline ,plenty of video's out there. Good luck.



Jim