Yeah, the metzler me880's come with a red dot (heavy spot), that should be opposed to the stem.
That dot wore off after a couple thousand miles (I should complain!)
Anyway, I marked the stem location with chalk(this decision was ill advised), and then I pried the tire off. I used Windex to help lube the beads over the rim. Do you see where my plan started falling apart?
Anyway, to re-balance, I had to take the tire half off, mount the tire without the tube, find the heavy spot, mark it with paint, let the paint dry.
Then, tire half off, tube in, tire back on, pumped up, then balance with weights.
So easy. It only took me three weeks to balance a wheel.