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Mr Milk said..
Why are there 3 holes at each end of the strap? Does anybody ever use the lateral holes?
If you are talking about the holes in the strap, the centre one is obviously for a single screw setup, and the two outer ones are for when you use two screw mounting. Usually, at least on the common brands, the two holes are an inch apart which aligns with the insert spacing on chinook footstrap inserts. I think some other straps have become metric and spaced the holes at 2cm which is a pain.
Also, there are a few anti twist setups that have inserts that go into the two outside holes and use the centre hole for the screw.
As for twisting, on almost all the boards I have modified I have used two screws at each end of the strap and have never had any twist. I bought a custom board recently and asked for the same and it seems that instead they use two screws on the front side of the strap and a single screw at the back end of the strap. It works perfectly. No twisting.