I use the Baerwald alignment gauge, as modified to take into consideration the TD160's specific dimensions, and available from the Vinyl Engine website. This alignment positions the cartridge differently to both the generic twin-point alignment gauges you can buy from such as eBay, and to the position recommended by the Thorens alignment tool built into the headshell cover.
However i've always been disappointed by how little difference any of the various alignment protocols make to high-end sibilance and inner-groove distortion. At most they make minor tweaks, with IMO no clear leader.