#2
theres two different kind.

adjustable like this

http://www.allparts.com/Black-Wrench-Holder-p/ap-0645-003.htm

or just like rubber like this

http://www.allparts.com/Black-Wrench-Holder-p/ap-0647-023.htm

you'll also have to get the wrenches.

http://www.allparts.com/Wrench-Set-p/aw-0131-000.htm

but you can get all that from allparts, through those links.

also a slight side note, the extra weight on the headstock will weigh it down and cause it to resonate less with the guitar, its not alot, but it might affect your tone or sustain (if you care, some people cant tell or dont care.) but you do have the locking nut already on there weighing it down more anyway. just food for thought.
#3
Quote by POWERMETAL!

also a slight side note, the extra weight on the headstock will weigh it down and cause it to resonate less with the guitar, its not alot, but it might affect your tone or sustain (if you care, some people cant tell or dont care.) but you do have the locking nut already on there weighing it down more anyway. just food for thought.

Yes, that extra 3 ounces is going to just make the neck weight UNBEARABLE!!!

Seriously, you probably wont even feel it. As for the resonance, Im no expert, but I dont buy it.
Better, Faster, Stronger

Kansas City Chiefs

Kansas State Wildcats
Quote by airbrendie
Hey guys in the last 3 weeks I ****ed all the girls in this picture, what do you think?

#4
no you wont feel it, but some guys can hear any slight nuance in their tone. buy the resonance or not its basic physics the strings vibrating in their normal way will make the headstock resonate, and adding weight/mass to that will make it resonate less, weather or not you can hear the difference or not is irrelevant. at any rate those are your links to where you can buy them.