brushless problems

[craigosh]

got my hands on a nice novak gtb with a 6.5 motor, ran it today at southport and in the first heat, the cap board desolderd from the positive and the cap blew frying it's positive connection..... :-(

Little unsure now what to do, do i replace the cap and try again, or replace the cap and get rid...

Anyone any ideas how to stop this from happening again? Would using a bigger cap help?

Also those plastic screws for the fan are cack, bent em putting the fan on... can i use some metal ones and does anyone know if they are american thread or metric?