The piece that came out of the mold was a bit rough so I trimmed it and sanded it with a dremmel. The shape it a bit off from the right angle section i started with. It is also full of bubbles, this is a common problem with resin casting and experienced modelers know how to avoid it. I font.
A flaw in the casting also made the stub only semi circular.
I am really encouraged by these results and my next attempt will be better.
Thanks for reading, please comment if you have any questions or help.