I've used M12 on my Locost simply because it was free to me if I did it this way.
The one issue I have now is that the harness brackets don't rotate on the bolts and are captive and I had to widen the 7/16" holes in the brackets ever so slightly. None of this was an issue at SVA. The tester wasn't interested in the fact the belts were captive. However, I am and am looking for some way round it now without redoing the whole thing.
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