Good find Alex! That's exactly what I need.

My plan was originally to use an Angle Grinder gearbox but I feared I'd run into complications changing the motor for a DC one.
Plus my plan is too run three blade simultaneously, so I don't want three gearboxes, I'd rather mount three blades to one shaft and then spin that.

Maybe I could nick the hubs off of Angle Grinders, been a while since I looked at one.

Thanks for the input so far everyone.