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Great info, but my points still stand.
I have installed a good half dozen of these on various cars (both BRZ and FRS) and there great units. Nothing but positive things to say.
The analogy of the hammer and nail works for me. However lets break that down a little further.
In your case the hammer (master) and nail (bolt and cap) and in 3 pieces. The head of the nail (the cap in this case) is separate from the nail (bolt). If you are hammering a nail with a head that's not attached, but sitting on top of the shank of the nail you will not be transferring the force exerted on the head (cap) of the nail to the body of it.
As for the surfaces being flat, the cap may be perfectly flat, however the master varies widly between cars. I currently have 6 in shop and they are all different. With one item being near perfectly flat and the other not being completely flat then you are not distributing load as described.
Either way, it works for the purpose designed and works well.
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