If it helps swing you Mel who does lambeth cyclists maintainance classes uses one in the class. When I attended the class I saw it used successfully for 6 weeks by a group of novices without failure (well one person blew their tube up by putting too much pressure in but that was the persons fault and the pump still worked).
If it helps swing you Mel who does lambeth cyclists maintainance classes uses one in the class. When I attended the class I saw it used successfully for 6 weeks by a group of novices without failure (well one person blew their tube up by putting too much pressure in but that was the persons fault and the pump still worked).