Good morning, I have an old (65)Guild Starfire with the single bisonic in the neck position. I don't really want to touch this bass as it is all original except for new ebony bridge saddles, but I have heard of a "mod" done by Alembic back in the early days where they added an extra magnet under the existing one on the pickup. Have any of you done this or heard of this modification? Any thoughts? Thank you for attention.