I purchased a HUMA regulator for my .22 caliber gen 1 marauder but before I install it I have a couple of questions. First the small screw in the front of the regulator is there to slow the refill rate and is supposed to be left two turns out but seems loose to me and likely to vibrate out. What have others done to be sure it stays in place? Also I've read that with a regulator the hammer strike needs to be less due to the constant lower pressure available to the valve, should I leave the o rings from a Bstaley tune I did before in place? Any other suggestions as to what to look at or change while I have the gun apart would be appreciated.