I thought this might be worth discussing here; in this month's edition of UK's The Guitar Magazine there's a guitar tech section by Dan Erlwhine (of Stewmac) who mentions Buzz Feiten's (famous for his altered tuning system) idea of inserting a thin vinyl shim on the front (towards the nut) of the bolt-on neck joint (of a guitar) with the express purpose of separating the neck and body to alter (in his opinion improve) the tone; according to Feiten, "the bottom end and volume of the guitar increased dramatically" and "I think the neck and body each have their own resonant frequency, and by separating them slightly you allow each to resonate somewhat independently". no comments about the effect on sustain though. now this is the exact OPPOSITE of what most luthiers think, ie. tight neck joints, or even set or through necks being best for sustain and tone. there was, however a similar idea from Alvarez with their "Scoop" guitar, with a hugely extended cutaway around the neck block claimed to allow greater sustain- in a review in Guitarist they couldn't detect any sustain improvements but said that the tone was "very even all over the neck"- which would be very beneficial for basses re. deadspots. anyone experimented with anything like this? I tried loosening the bolts on my Fender P-bass Plus as indicated in the article, but couldn't really notice any difference..... ps. in the same issue of the mag there's a very interesting interview with Les Paul- apparently he came up with the idea for the headless guitar- Gibson wouldn't take it up so he let Ned Steinberger take the idea for free....and later Gibson licensed it off Steinberger.