Just been to halfords and bought a cateye daylites solo II light model hl-rc220 which with a little bit of adaptation will fit onto my scope ok, along with the on/off high/low switch.
Complete kit was £19.99 because they are old stock must say ime sure it will do the job and yo uget the clamps included supposedly for handle bars but will go on scope.
Thought this might be of interest.
The only thing i will have to make is a tube to stop the glare.
hughiep
Once navy always navy. Royal navy stokers we steam as a team.