I have a Nova keepon .12 and I want to replace piston and sleeve. I believe a flash .12 is ts basically the same internally and my question is that true second question is if this is true will a flash .12pt piston and sleeve work in my keepon .12? Or do I need to use flash .12 piston and sleeve? I see on the pt has 3 holes under the exhaust port that the flash .12 doesn't have.