As per Frontiersman's suggestion, I made a mag release tool from a vise grip style plier. It took much longer to make but it is a more precise tool. I had thought about making a locking ring for the slip joint plier version of this tool but a vise grip would make this addition unnecessary. By adjusting it one can align the release and spring to the point that an unstaked retainer pin will fall out under its own weight. At this point the 2 parts are perfectly aligned for installation. Great idea Frontiersman.