I've got a turntable project going right now - a buddy of mine has an old Pioneer PL-12 turntable that he dug out of storage. So far, I've replaced the headshell (hooridly rewired, melt marks), cartridge and belt. I got the cartridge aligned (dug out the old Geo-Disc from MoFi), arm got balanced, tracking force and anti-skate set. I'm curious about the tonearm - on the backend near the weight on the left side is an arm that is set out about 2 inches, with a moveable weight with set screw to hold it in place. What does that little arm with the weight at the end do? Does it provide more weight if a very light cartridge is used? I didn't get the owner's manual, and it's been awhile since I've set up a turntable - anybody got some thoughts to help me out?