You might consider determining which version of the TD160 you have, and unless someone changed the arm along the way that will likely tell you which version of the arm you have.
I have read that the original TD 160 MkI has a 10 mm platter bearing with a metal ball inserted into the end. The more recent TD 160 MkI bearing is also 10mm but it has no ball at the end of the shaft. The MkII has a 7 mm platter bearing.
You can get a fairly accurate idea of a tonearm's effective mass by installing a cartridge of known weight that also has a stylus guard. Put the stylus guard in the down position and remove the counterweight(s) from the arm. With a digital scale then measure the resulting downforce of the arm and subtract the weight of the cartridge to give you a close estimate of the effective mass. Hope this helps.
Jim
I have read that the original TD 160 MkI has a 10 mm platter bearing with a metal ball inserted into the end. The more recent TD 160 MkI bearing is also 10mm but it has no ball at the end of the shaft. The MkII has a 7 mm platter bearing.
You can get a fairly accurate idea of a tonearm's effective mass by installing a cartridge of known weight that also has a stylus guard. Put the stylus guard in the down position and remove the counterweight(s) from the arm. With a digital scale then measure the resulting downforce of the arm and subtract the weight of the cartridge to give you a close estimate of the effective mass. Hope this helps.
Jim