Is there any real way to properly pick one, my results are mixed, sometimes I pick to change (not so good) sometimes to control (which is what I want), any tips for getting better chances for control vs. change?
My primary reason for wanting control is there have been times where a customer needs to do a re-key but wasn't provided with a control key, so i will try to pick it to control, but if it gets to a half hour or so I will use a drilling jig which allows me to drill out the control sleeve, which can get expensive if I do not have a replacement core of the same section requiring me to charge the customer to replace all of the cores.


