Its the little weight hanging on a string(also referred to as bias).I don't know if this is the correct instructions for your arm(this is for 3009R),but I hope so unless you still have yours.A lot of mine drifted 1-2 MM outward during cue down.Making sure everything was clean(so it doesn't slide as easy)and set correct still left me lowering the arm 1-2 MM inward on a lot of arms.The anti-skate seems to do it on a lot of them.A link to a manual,but may not be the correct settings.LINK>>[http://www.theanalogdept.com/images/spp6_pics/SME/SME3009R/ModelsRtype.pdf]SMEII?>>[http://www.analogue-classics.com/html/3009ImpManual/13.jpg]Pic[http://www.audio-extasa.eu/popup_add_image.php?pID=946]