Best suggestion however if wanting to use springs I would place pickups in the holes and start the screws without springs first to create a female thread in the timber. Once you have about 5 mm to 10 mm depth on all 4 screws (actually 8 when adding up both pickups) unscrew them all, insert springs under pickups, push pickup down, start screwing down the screws. Pretty simple process but would also add the high density foam too as it has more 'spring' action than the flimsy springs.
Cheers, Waz







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