Update: trying the circles made me realize that without a light it is not too good to see the scale during the night. So after a bit of playing around with LEDs and how to mount it i decided to use the original plastic handle supplied with the scope. This has a natural 45 degree edge so i drilled a hole from the backside of the handle and threaded a LED through to where the handle bolt connects then drilled a smaller hole parallel to the bolt hole and threaded the wires though to the inside of the base, connected a 12V DC plug and as you can see from the photo lights up and right on target!.