I've had a Lifeline Track Pump since June last year. Recently, it's gone faulty in that when I pump up Presta, air escapes from the Schrader end and vice versa. Wiggle want me to send it back and IF they find a fault they'll pay my postage. Also, IF they find a fault and it can be repaired they'll charge me for the repair. At 20 quid for the pump, I'm wondering if it's worth the bother. Has anybody had similar problems with this pump and how did they resolve it.