Do I need to balance props at all??

Neither way is going to give me problems;

I have lots of plywood, and a CD.

Model Airplane News suggests a tip for balancing props.
You just use the stuff i just named and u can build a prop balancer!!!

I just dont feel like building one.
So do i need to balance my prop????

PS will 10% nitro not run as effectively (ie less power) than a 15 % nitro???

Also Do I have to balance my spinners?

Tanx-A-Lot