Had the same problem, bought a Toolstation complete flexi, with collet etc, only had to skim the threads slightly on the main body to make it fit, as new collar was marginally smaller, cost about £15, but was worth it to still be able to use it. Wouldn't be without it.
The 'performance' spring cable has a small block on the end that the Toolstation didn't, and would probably make it a weak point if you tried to weld/solder it onto new one, but this works well!!
Diann, August 2011