There is the old trick of taking a Torx T-15 bit from any ratcheting magnetic tool bit screwdriver and wedging it into the end of a standard Bic pen (pull out the ink and pen cartridge from within, of course). This will work in a pinch and the shaft is long enough to reach down inside the handle. Or get a long extension for the bit and work both down the handle and it will be enough to undo and/or tighten the screws. The latter is what I've done.

73s de Phreakout. :rambo: