Dalsnibba

They need cutting down the centre of the section which the bolt goes into, for which I need a very, very narrow saw- any and all suggestions for where to source said saw welcome.

The material used is very springy, it should happily open to the diameter of the tube and snap back.

That's the theory anyway - and why my bike is the prototype test-mule.

maybe a jeweller? they use very thin files and probably saw blades - failing that a lazer.