Probing surface for auto-levelling

I’m making PCBs with my MK2 and need to auto-level the copper clad boards. I’m using OpenCNCPilot and it tells me to connect my probe to A5 and ground on the Arduino. I’ve opened the control box however I can’t access the top of the Arduino. Is there any way I can make these connections?

I appreciate any input!

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I don’t have a LongMill, but you just need to connect it to the same input that the probe is connected to. Should be a probe signal connection and a connection to ground.

@sc18 As Neil said, is there some reason that the probe inputs on the controller won’t work for you?

If you do decide to access the top of the Uno, it just unplugs from the board. It is not soldered.