A week or so ago I posted about my problem with a pair of
pliers which slipped into a cavity through a narrow opening.
I purchased a moveable
mirror on a metal wand. I also purchased
there a magnet. Each cost about $6-7.
From an electronics store I purchased, for $12, a small LED
flashlight.

A long time ago, someone I knew had a similar situation, but figured it
would be cheaper to buy new pliers. I've applied this a number of
times. The last was when I needed a platform so kids could reach the
start of a zip line. Pre-made ones cost a lot. Do-it-yourself plans
cost over $100 just for the materials. I ended up buying a deer stand
on sale for less than any other solution.