Getting the oddest leak from my X-valve/L10/ULT. Whenever I gas it up, there appears to be a leak from the on/off region. Replaced all o-rings (except powertube, powertube spacer/washer, and carried). New reg valve pin and reg piston assemblies. If I press the trigger, the marker fires and the leak stops, but resumes as soon as the trigger is released. Any advice/suggestions?