Korg M3 quick help question for 76 and 88 owners.

[BrendanG]

Hi.
Is anyone near their M3 76 or 88 that has a tape measure.
I need to know the dimension of the rear beam. Not the length just the height of the square part.
It’s the long square bar going across the back from left to right and It’s approx 30mm square and has central grooves.
Can someone measure the bar exactly to see if it is 30mm square and also tell me the distance that the central groove is from the edges of bar.
I want to make a little figment that slots into the groove of the bar that I can clamp down.
Thank you.

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