I had a bunch of strat pickups on my work bench yesterday, and played around with them a bit. Using the blade of a box cutter, I noticed that I could lift an alnico 5 pickup off the table with just one or two pole pieces stuck to the blade. To lift up an alnico 3 pickup, the blade had to be touching 5 or 6 pole pieces, otherwise it would fall off. Is this normal? Is alnico 3 that much weaker, or have these pickups lost their magnetic charge?