Casting a lead RC sailboat ballast bulb in CNC aluminum molds

Just showing how I make a ballast bulb for a US1M class sailboat. I have other videos showing the CNC carving. There is also a link to the design files and a build thread below. Design files: US1Mbulb- https://www.thingiverse.com/thing:532... Footy bulb - https://www.thingiverse.com/thing:535... Build thread: https://www.rcgroups.com/forums/showt...