If I tune down a step, which I tend to do for a song we play, I can capo three strings at the 2nd fret and have DADGAD without retuning. I can capo on the 2nd fret with another capo, and the two high strings with the Spidercapo and have the tuning for the cuatro.
Then the knob that clamps the capo in place broke. Return it and try again ... grumble ...