I've got one from many years ago.
I decided to try investment casting for the first time.
I didn't have a centrifugal machine, so I made a heavy duty sling
caster. It was really solid, and I'd figured out an effective
cradle... or so I thought.
It was about 500g of 80/20 a nice white bell metal.
I had an old enameling kiln, so I ran that for a short burn out
cycle (I'd previously had the flask in the oven melting the wax out).
At the 2 hour mark I had a perfect burn out, at which time the
electric element in the kiln expired. "Meh", I thought. "These things
happen, a new wire wont cost me much".
The melt was ready, on time, only takes 8 minutes for 500g. The
flask was placed into the cradle (but I didn't do it securely).
Got up the gumption and spun the sling caster, after the third
swing, the flask came loose and sped in a straight line diagonally
across my back yard, depositing granules of 80/20 as it went. I felt
like a prospector picking up those granules.
Funnily enough the casting was a success.
However bell metal is brittle and melodious, but that's another
Regards Charles A.