I have 2 Nerves and some spare parts. I have the NDZ bolts in both so I have some spare stock bolts laying around. I was thinking of cutting an o-ring groove in the bolt like the new Impulse has, to maybe make it a little more air efficient. I was also thinking of trying to drill the venturi design out and make it into an open-faced bolt. I feel I should say at this point that I would not try this iff I did not have the spare bolts. I was wondering iff anyone else had tried anything like this and iff anyone could give me any advise before I start it?