The Mobi ones are supposed to be alright.
You can use the ones at garages - but they will do bad things to your bearings if you point them in the wrong place.
@Howard started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
The Mobi ones are supposed to be alright.
You can use the ones at garages - but they will do bad things to your bearings if you point them in the wrong place.