Probably depends on your tool the most. There isn't much room in there for error and misalignment is easy to happen. Since each pin is machined at each end to allow the pin to be captured under the spring tension. Like if you tried to drive the pin out without removing the spring tension, you'd probably damage the body of the ARGO plug. If you over compressed the post, the same would happen where the pin would be captive again just at the other side of the pin.