Peter,
I just love ingenuity like that!
Love the dust cap too .....made for the job
I have several lumps of sewer pipe I have hoarded for years with
just that sort of project in mind.
I once made a little prototype right-angle spot scope from
a photocopier lens and first surface mirror.
It worked quite well but was bloody heavy, mainly from the
very thick lens.
I also love seeing a good clean workbench...mine isn't quite
equipped with LCD screens yet though
Thanks for sharing,
Steve