no you cant get rid of the chatter by tapeing weights to the driveshaft. hahahaha. its GEAR noise man, like inside the transmission, it goes up through the shifter. its sits about maybe a full inch or more lower.
whoever told you taping wheel weight to the driveshaft reduces chatter is a moron, if anything it wouldmupset the driveshaft ballance( as you have NO way to see if your doing good or harm), it would probably make it worse.
maybe your tralking about the sifter shaft, which is also a bad idea, because B+M shifter is counterweighted for more precise shifting(and you can TELL!)...doing that would upset the ballance there, too.
NISMO unit is available from:
http://www.jspec.com
I got my S/S clutch line from them....good guys, but the dockers strike ****ed my delivery time

-chet