This is a most excellent idea.
Maybe with pics/drawings of the said items in question?
Edit:
Televue RFL-4087 focal reducer system threads is a
M65 diameter (2.55") x 24 TPI (UNC).
Most finder illuminators are M8 x .75mm pitch thread.
Skywatcher reticule eyepiece illuminator is M8 x 1mm pitch thread.
Thumbscrews many many types
here.
edit:
edited TV threads dimensions.