I forgot to say - some paintball shops have the removal tools and will remove your regulator for you. The tools cost $50-60 and I can't see buying one to use a couple of times."bigben11"If I have time today I am going to see if I can make device to remove the OEM regulator. I have been told that you can use a 1 inch PVC pipe, cut 4 slots in it to fit around the fill tube, gauge, and burst disks. Make it about 3 inches long and at the other end drill a hole thru both side to hold a screw driver. Hold the regulator in place with the screw driver and use a strap wrench to twist off the bottle. Don't know if this works, but worth a try.