I used a bar magnet similar to the one in the write up in AltGrendel's sig, which I found on Amazon for about $7. Seems like round ones should work, but may be tricky to put in place. I put the bar between the plastic cover and the actual pickup. It does look a little weird and I had to remove the springs from under the pickup to lower it. I can feel the magnet pulling at the screwdriver when I adjust it, which does make me wonder if it interferes with string vibration. Still much cheaper and easier than replacing a pickup I probably wouldn't use much.
I agree. That's why I hoped the little round guys would do the trick, but unfortunately, I'm not hearing a difference, so it looks like the bar it is!
Thanks for the help.