Hi Holly, I agree with Lak.
Your Teres 160 has an acrylic armboard. On tables with hardwood armboards, Chris often glued the VTA adapter in place. On acrylic armboards, the only thing holding the adapter is a set screw, which may have loosened up over time.
The screw is accessed through a hole at the outer end of the armboard. You'll need the right sized hex key.
I'm not sure exactly how the screw interfaces with the collar of the VTA adapter. It may screw into a threaded hole (best), tighten against a flat spot (better) or just tighten against any random spot on the collar (oh well). If it's meant to hit a particular spot, that spot may have rotated when you attempted to adjust arm height. Check that before re-tightening.
Your Teres 160 has an acrylic armboard. On tables with hardwood armboards, Chris often glued the VTA adapter in place. On acrylic armboards, the only thing holding the adapter is a set screw, which may have loosened up over time.
The screw is accessed through a hole at the outer end of the armboard. You'll need the right sized hex key.
I'm not sure exactly how the screw interfaces with the collar of the VTA adapter. It may screw into a threaded hole (best), tighten against a flat spot (better) or just tighten against any random spot on the collar (oh well). If it's meant to hit a particular spot, that spot may have rotated when you attempted to adjust arm height. Check that before re-tightening.