I play a reso- I can say with 99% certainty that nothing at the top of the neck could help resonate the thing- only thing I can think of to make the thing sound louder at the top of the neck could be some kinda pickup installed by someone on acid.
Funny thing songster Bob- I took a turn around Jacksons in Annandale the other day and there were a whole bunch of reso mandolins. if anyone is interested I play a HD28 Martin, a G&L Telecaster and the Massey Ferguson- er sorry - the reso.
regards to all
Micko