Several drive side spokes on a mountain bike rear were damaged the rear mech being pushed into the wheel by a rock, with one snapping completely. I've replaced the affected spokes and have managed to get the wheel (almost) perfectly true laterally.
However, I've noticed that the wheel is out of true radially -- i.e. it has high or low points of 2-3mm in a couple of places. I don't know if this was present before I replaced the spokes or not, but I'd like to improve this before putting the wheel back on the bike.
I think I need to tighten (or loosen) spokes equally on both sides at the high (or low) points to resolve this. But doing so seems to have little or no effect when making the kind of 1/4 or 1/2 turn adjustments I used to true the wheel laterally.
Am I going about this in the wrong way? Or do I need to make much bigger changes to spoke tension to affect the radial profile of the rim?