Tim Zimmerman wrote:
My Black&Decker electric mower was loan to friend. He ran the
mower over several boulders several times, chipping a couple
pearl size sections off the blade. Possibly, this is causing the mover
to vibrate to the point of causing a shoulder sore.

I remove the blade, then clamp it to a vise grip. I have an angle
grinder that I will use to fix the balancing problem. The problem is,
I've never done this before. What is a practical way to balance a
mower blade?

For "pearl size sections" missing, don't even try to balance it. Just
replace it. Balancing a blade makes sense for normal wear; it's not
indicated for acute damage.
--
Bo Williams -
http://hiwaay.net/~williams/