I'm guessing you loosened the side screw stop?
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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.
Thank you all very much for your responses. I had not loosened the screw for the adapter to the tonearm; both the VTA and tonearm are securely fastened. I don't know what I was doing - crossing my eyes?!? - but I managed to get the VTA set correctly yesterday evening, at least the arm tube looks level with the record to me!
Still no joy with the turntable, though. I am having a problem with the sound being very distorted now, but I will start another thread because I don't believe it has anything to do with VTA or the adapter.
(Why is it that even when logged in, you have to put in your Username and Password again under your post? Rather annoying! )