Positive Adjustment Locking System Positive Adjustment Locking System The P.A.L.'s are two small proprietary metal disks which go into the set screw hole of your release to keep the set screw from bearing directly on the cam. So simple but so effective. Most people think it is the set screw denting the cam which causes the cam to move when tightening. The cams are 60 Rockwell and can never be marred by the softer steel set screw. The set screw itself does distort however, which is the cause of the problem. By using the P.A.L.'s the set screw no longer touches the cam so any rotation will be minimized. In some releases you may have to thread the hole deeper or make other modifications but they should work in most cases. The design of the Zenith Backfire will not allow for the use of the P.A.L.'s and no changes will be made to update it. There are (4) disks per pack, enough for two releases and they sell for $5 per pack, shipping included. Send $5 cash for each pack, along with your return address and I'll get them right out for you. If you can't get US dollars or don't trust mailing cash, use Pay Pal and send to joe@zenitharchery.com but make it $6 in that case. Please, no phone or credit card orders if ordering PAL's only. Thanks.   Bookmark this page and visit often! All material herein © 2000 On Target Solutions, all rights reserved. Zenith Archery Products and ZAP are service marks of On Target Solutions Incorporated. webmaster Revised: May 29, 2006