Go ahead and re-connect the Gemma M0 to the short USB cable and USB-to-Lightning adapter, make sure the Gemma M0 is turned on, then fire up your pinball game!
There's enough space to slide the iPad up or down as needed to access the power button, and you can adjust the volume with the onscreen controls, since the physical volume buttons aren't accessible.
Here's the live stream video for more details:
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