I wear a krypto chain and mini-d around my waist when cycling, but instead of locking it to itself I've put a toestrap through the second link of the chain and through the lock - it's adjustable and quick to come off, and it costs about £2.50.
(It clearly doesn't solve the falling-off issue, although I once crashed when wearing it and the ambulance dude undid it, no bother)
I wear a krypto chain and mini-d around my waist when cycling, but instead of locking it to itself I've put a toestrap through the second link of the chain and through the lock - it's adjustable and quick to come off, and it costs about £2.50.
(It clearly doesn't solve the falling-off issue, although I once crashed when wearing it and the ambulance dude undid it, no bother)