My Giyo "Air Supply" mini pump has broken and I'm wondering if anyone has experienced this and fixed it.
(The "Air Supply" is a 30cm thin aluminium pump)
Basically the pump won't pull air back into the chamber after pushing the air into the tyre. The first stroke pushes air into the tyre but the return pull won't suck air. I'm assuming a one-way valve has got stuck but there appears to be no access to the valve to unstick it.
