Mounting things on handlebars:

P Clips! The ideal diameter for most handlebars is 21mm

	Stainless Steel P-Clip Avaialble in as range of sizes 22mm with an M6 mounting hole available from Vehicle Wiring Products under cable fixing. High quaility clips are made by JCS Hi-Torque in 2 band widths. JCS also make excellent hoseclamps
12mm band 21mm and 22mm dia.	20mm band 22mm dia.

When fitting a bolt or stud to the clip, put a large diameter (mending) washer that fits right up to the 90° bend in the clip. This will stop the tendency for the clip to open