On Tue, 4 May 2021 at 12:59, John  wrote:
>
> Great Ideas GGs,
>
> The material I am cutting is wood, mostly hard wood.

If it's hollow, can you fill it with sand and/or peebles, and then
rotate the object (with a electric drill or a motor).
I've seen people cleaning all sort of objects by placing them in a
cut-off plastic bottle, and filling the bottle half with sand or small
peebles. Then the container is attached to an electric drill, and is
turned for 5, 10 or 20 minutes.

FWIW.
Chris