Check the listing for details. JTS Aircuda Max, Heavy Hammer Spring.. Condition: New. Listed at 15.00 USD. Heavy Hammer Spring for the JTS Aircuda Max. You receive one spring. The spring has a higher spring rate and increases how hard your Aircuda Max hammer hits open the valve. This, on its own, will increase the power of your Aircuda Max, and you will use more air! Gains are increased with the use of other tuning accessories like a lighter valve spring, barrel, and transfer port enlargement, and PEEK poppet with enlarged valve hole when running high regulator pressures. I have not got a light valve spring figured out yet. I do have an extra heavy spring also BUT it has been known to snap the hammer cocking pin, the pin that links the side lever slide to the hammer. Until I get some stronger puns made, you can request the very heavy spring at your own risk. I have made these pins, and it fixed the problem. Thank you for looking at my listings.