1940's and 50's Fenders Broadcaster, Esquires and Telecasters have a 'shelf' along the treble side of the neck pocket and most are known for their natural sustain. My '78 MM Sabre I has a pretty prominent shelf and is also noticeably very resonant unplugged. That got me thinking, did Mr. Fender intend for it to be there or was it just a by-product of the body routing process? There's even a small shelf on the bass side… Would having a wider surface area under the neck transfer more sustain? I'm curious too when the shelf disappeared… once CBS took over? Do late 60's and 70's tele's have them? None of the 80's G&L's I own have a prominent shelf and while they're pretty resonant, they don't have the zing that the Sabre I does unplugged. Any thoughts on this? Has the 'shelf' ever been discussed here on TDPRI?