Here's the problem...

The two halves of the X-valve are twisted in the wrong direction too hard. At this point, the aligment marks on the bottom side of the valve are approx. 1/8" in the wrong direction. The valve will not sit correctly on the rail, and the bolt scrapes agains the mainbody when the marker is fired.

I have tried to seperate the halves with a wrench but the bottom of the valve began to scratch (even with a towel wrapped twice around). I thought about putting the valve in a vice, but I am not sure how strong the aluminum is.

How can I get the two halves apart?

This valve is BRAND NEW. I have heard that AGD does not test the X-valves before they ship them out. I DO NOT want to pay shipping costs and wait weeks for my valve to return. I am not satisfied, to say the least.