Seems lately I'm getting several Kral questions again. Here's a quick cheap trick to add some power. The trick is cheap but you need expensive tools or to make a friend with someone that has them... lol
Tap the valve 1/4x20 at the valve stem exit. Epoxy in a 1/4x20x3/8ths brass screw. Turn the head down flush with the rear of the valve and drill a new hole to match a QB78/Gauntlet or equivalent smaller diameter stem. Shorten it to match the factory length and a reduced size poppet from Delrin or Peek. Adds a larger flow of air for a quick short pulse.
Tap the valve 1/4x20 at the valve stem exit. Epoxy in a 1/4x20x3/8ths brass screw. Turn the head down flush with the rear of the valve and drill a new hole to match a QB78/Gauntlet or equivalent smaller diameter stem. Shorten it to match the factory length and a reduced size poppet from Delrin or Peek. Adds a larger flow of air for a quick short pulse.