Hurst Comp/Plus Short Throw Shifter

I just installed this shifter and overall am very happy with it. I was wondering though if anyone has found a way get rid of that rattling sound coming from the shifter ball. I tried tightening the spacer nut a bit, but that didn'tseem to help. I noticed that my kit came with a little cone shaped rubber grommet. I don't recall seeing an application for the installation of this piece anywhere else on the kit, I hope I didn't miss something during the install. Can anyone offer any advice and or suggestions?