[bojan]

Long time ago, in other half of the last century I bought small russian telescope (10x30, with terestrial eyepiece, image attached).
I didn't use it much as such... terestrial eyepiece proved to be a good microscoope (~10x), an the rest I used for a while as finder (eyepiece came from broken rsussian binoculars - erfle or similar design, very wide field).

Last night I added crosshairs, made from optical fibre core.
I glued two pieces in place in eyepiece tube (ony one side of fibre piece, to avoid bending).
This is my second DIY finderscope with optical fibre crosshairs, another one is used on my 10" newt.
Opical fibre is thick enough to be very visible in eyepiece, very straight, and can be illuminated from inside to improve visibility in the dark.

I will post images of DIY version later today.