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Hi James,
I’ve just looked at my C14 OTA (which also has the two dovetails arrangement you described on yours) and although there are pairs of drilled holes with screws in at the locations you show in the second image they are only at the rear of the OTA and look to be for the finder. The distance between the holes is roughly a centimetre shorter than the distance between the mounting holes in the dovetail. I haven’t checked if the screws are the same size as those used with the dovetail, they might be smaller. So you would have to consider drilling and tapping holes in your C14 at front and rear of the OTA which would be way too scary a job for me!
Good luck, Richard