How do I create a curved slot on a curved surface? : rSolidWorks

Modeling a slot on a cylinder, 4th axis machining with bull-nose cutter slot axis Y-Axis Sensitivity, % Targeting Sensitivity, % Scope Weapon Slot 1, 2 Weapon Slot 2, 3 Weapon Slot 3, 4 Weapon Slot 4, 5 slot games demo Here is a tutorial explaining how to add a axis in the center of a slot so you can add fasteners

slot apple I am unable to locate center of a slot in drawing Is there a specific way to make slot in model so that the axis can be located over there?