Magnets can be moved or changed on Stratocasters that have molded bobbins. I’ve often changed the magnets in the molded bobbins with others found from broken or destroyed pickups. At times older magnets have less string pull and staggering the pole pieces for the desired string output. I like replacing the flat poles (all the same length) with staggered ones to get unique sounds out of the pickup. You can also reverse the magnet pattern to make them left handed. The molded bobbins seen on Stratocasters have a nicely wound coil with plenty of turns for output.

Using older or aged magnets make them warmer and fuller sounding with less harshness. Make sure when replacing magnets that you keep them all the same polarity. The six magnets should either be all south or north facing the strings. With the molded bobbins you can flip over the six magnets in the center pickup and reverse the two lead wires connected to the lever control and ground. The guitar will be humbucking in the 2 & 4 position using a 5 way lever switch. This is useful when playing in clubs where bad wiring interferes with your solos or when to near the transformers in your amp.