Originally Posted by shredxcam
Turn the pump rod so that the screw pushed down enough on the at lever
Thanks. I figured that had been the problem but didn't take the time at pandemonium to sort it out. The backside of the slotted AT screw has a sharp edge and as you can see in the photo, over the years it has not only worn through the annodizing of the AT arm, but it's slowly shaved down the metal itself.
Thanks for the comparison on the cam difference between slider & pivot triggers. I'll get in touch with CCM about a replacement.