It gets mentioned again and again, but I never heard him confirm or deny it. He was involved with Gibson on and off, the G-3 pup set-up is his design and he also had a hand in the RD Standard stacked humbuckers in single coil format. One of his disciples, PJ Marx (probably only a distant relative of Karl M.!), would a decade later provide the pups for the Q-90. By then Bill Lawrence's occasional presence in Nashville was seen more as a curse than as a blessing by the newer generation of luthiers there.