Carradice 10 Piece Multi-Tool
What's that? You ride a bike but you don't carry a multi-tool? Well that's plain daft. Here, have this one. It'll help you fix many an ill, mid-ride and stop you having to make that embarrassing call to a mate, parent or minicab driver where you ask if they can give you and your bike a lift home.
Our mechanic uses one to endlessly tweak his saddle height in pursuit of that most efficient of ride positions. After nearly thirty years of trying he thinks he might be getting close now. There's really no hope for him...