If you are going to use a G7 capo, which is the best I've tried until it breaks, always carry a spare Kyser, Shubb, Dunlop or whatever. When it breaks, hoo boy does it ever break! I have had a G7 fall completely to bits when I released the lever. On guitars that tend to go sharp when capoed (short scales or jumbo fret models like my Gibson Songwriter Deluxe), I've found the Dunlop Victor (which has adjustable tension via a small thumbwheel) to work best.