I have never measured the gap. always just slide it together and line up the couplers. I set them so they aren't touching but have a small air gap. I would guess somewhere between 1/16 and 1/8 is where mine end up.
I'm pretty impressed with their response to your matter.DHT did take care of the matter today, warranty clerk was waiting on my call. They are sending the coupler and the MOUNT, just in case it is out of tolerance. I also chose DHT because of their presence on this form.
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