Losi Tire Balancer?
#16
From looking at it you need to completely disassemble it and then heat the aluminum tube that the bearings sit in with a heat gun. Once the aluminum is hot enough it will expand and the bearings should drop out. You also might need to tap the tube with a block of wood or something to pop them out.
#17
MAKES A HUGE DIFFERANCE... but get a real balancer, one without bearings