Stripped hex head bolt on Z-20 braking motor

I bought the new braking motor for my Elite Journeyman. In removing the coupler from the old motor to put on the new one, the bolt stripped and I had to drill it out. Does anyone happen to know what the specs are on that bolt? I know it takes a 2.5mm key to remove it, but that’s all I can find on it. Thanks in advance!

The coupler uses an M3 screw.

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