1" 1/4 Eyepiece ViewFinder adapter

Telescope ViewFinders comes with incompatible eyepieces. This adapter allows to use either a regular good quality 1" 1/4 eyepiece or a Guider camera (webcam or ccd).
The scad design is paremeterized so it can be customized for your ViewFinder width and focal lenght.
Adapter thread is not implemented nor necessary as it just fit into ViewFinder inner thread at first insertion. Use black plastic, as reflections should be avoid.