rattling sound coming from rear right windows finisher on 04' Coupe

[Smartidiot]

Hello Guys,

Just recently I found that there is this rattling sound coming from my rear right windows finisher every time i drive on bumpy roads..

after a serie of stop-and-go self testing, i am able to identify that it's the clothes hanger that's making this annoying noise..

( I have a 2004 G35 Coupe 5At btw..)..

while this is indeed not a huge problem, it does bother me at times so that i decided to leave it flat open for now...

here i am just wondering if anybody has experienced the same problem on their coupe and how do you fix it .. (i realize leaving it flat open would eliminate the noise totally.. but it just doesn't look too cool in a way.. ...)

any suggestions are greatly appreciated.