Amateur astronomers are adept at improving equipment by ingenious use of non-orthodox materials. Here are a few examples

• A finder for visual astronomy, the Celestron Right Angle Correct Image (RACI) by Martin Whillock, York Astronomical Society, with Robin Scagell
• A sun finder for a refracting telescope by Martin Whillock.
• A laser polar alignment by Martin Whillock.
• A right angle viewer for polar alignment scopes by Martin Whillock.