I have searched the threads and cannot find the answer. I just picked up the A7 which has an adjustable center post that is just way too loose and constantly loses the connection and is causing the resistance to vary and does not fire properly. I tried putting an o ring under the center post but it completely cuts off the air flow. I am gonna buy another so that I can use the o ring and drill out a side hole but in the meantime had anybody been able to find a fix without drilling a side hole? I know there's a way but I can't figure it out. I am really tired of constantly talking it off my mod and loosening the center postjust to do it again in 5 minutes. thanks in advance and like I said im really trying to avoid drilling a new air hole till I have another ordered.