I believe you are wrong. I certainly don't follow your rule. See, for example, A versus An: The Indefinite Article | Writing Guide | English Rules
Maybe you can google a counter example?
Cheers
Trantor
Why do you say metal-to-metal contact is non-DIR? A metal snap hook on an SPG coupled to a metal D-ring is standard DIR so why not a metal snap hook to a pocket D-ring, say?
Is a nylon loop attached to the pocket D-ring for attaching metal snap hooks OK in that that avoids metal-to-metal...
Just fitted the mini STA pair to my DR backplate.
The top one is clear of the top pair of cam slots so with the mini STA the tank position can be the same as with no STAs. But is weight is needed and not just an alignment aid then will not be of interest.
Looks like the Oxycheq mini STA pair...
I recently bought a DR plate and venture wing and find it fine when I strap the tank on myself but the dive boat personnel would just tighten the straps with the tank at any angle so I found I had to redo it each time.
I've just ordered a pair of mini STA brackets just to aid initial alignment...
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