My dad was a longtime fan of Scruggs' guitar playing, and he had a few stories about it. . .
He was standing in line one night to get into a Flatt and Scruggs show, and got into a conversation with an old farmer about the greatness of Scruggs' banjo playing. After this had gone on for awhile, the farmer added, "Yep, and he's the beatinest thing I ever hyeered on a git-tar, too!"
Once on a Flatt and Scruggs TV show, there was a request for "Nine Pound Hammer" which was coming up right after a tune Scruggs had played on the guitar. He was on his way back for the banjo, but when Flatt introduced the song, Scruggs just turned back to the mic and tore into it on the guitar, taking the entire band by surprise and picking the living daylights out of it.
At a live show one night, Dad got a close-up look at Scruggs' old D-18 (the one with the entire upper half of the top covered with a pickguard) and said that it had a hole the size of a dime in the back of it.