Answer:
Though blind as well, can lead the blind well.
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
A house of wood in a hidden place. Built without nails or glue. High above the earthen ground. It holds pale gems of blue.
I have a neck but no head. I have a body but no arm. I have a bottom but no leg.
Forward Iām heavy, but backwards Iām not.
What is full of holes but still holds water?