The retip of the top AT carts ( top Signets included) make
only sense if the stylus only need to be changed. Either because
the stylus is lost or worn uit. The cantilever can't be changed
because those are fastened to the tension wire which is in
the tube behind the cantilever. One should use an cheap AT
stylus/cantilever combo to experiment. The whole combo can
be removed from the stylus holder by losening the small screw
on the inside of the stylus holder. Then one can see the whole
construction which is identical by all AT carts. From such experiment
one can also deduce if the reverse job can be done. If one is
not sufficient skilful for the job one should not try.
The suspension (aka ''rubber ring'') is just in front of the stylus
holder tube. Its hardness determine compliance. When the whole
cantilever/stylus combo is put back in the stylus holder the
mentioned small srew should be fastened after the centering of
the stylus is done.
For stylus only retip I can recommend Expert stylus (+/- 200GBP).