Did vivian campbell USE the holydiver pickups that Bareknucle pickups sell (probably a stupid question but you can dismiss it as I was not born when he played with dio and he probably used a strat and I've never seen a strat with more than one humbucker.) or is that just the name due to the sound it produces? And could somebody tell me what the difference between standard bare knucles and calibrated ones is please (before asking this i guess i really should have found out what calibrated means, forgive that!)