The Signet TK5Ea is a sweet cartridge but there is an even better stylus for it than the original....
The AT 155Lc is a nude Line Contact, pressure-fitted on a beryllium cantilever and transforms the TK5Ea into a real 'Player'....😎
Unfortunately, they stopped making the 155Lc stylus and finding one takes patience.
http://www.head-fi.org/t/691757/audio-technica-at-155lc-cartridge-stylus-has-no-more-than-50-hours-s...
Best bet is to look for a complete AT-155Lc cartridge with low hours and 'grab' it.
This one looks to tick all the boxes.
Good luck...