With the marvellous mini-Brewzer on a key-chain who'd use the DoohicKey to open bottles.
During recent mods I first noticed that 7mm hex wrench provides a ratchet action on 1/4" hex. The DoohicKey opener is not flatted but my sample provides ratchet drive for 1/4" and I think it could be improved. So this time I won't be knocking-off your exact mod but the smaller flat driver makes sense
Or did the grinder slip