If money is no object
, and you want perfection
you'll probably spend more than you did on the scope!
If the scope has a 2" focusser:-
* 2" Howie Glatter laser with barlow
* Three 2" Catseye tools - sight tube, cheshire and dual-pupil autocollimator
Sight tube followed by laser followed by iterating the cheshire and autocollimator.
However these tools may exceed the engineered capability of your scope due to slop, flex, mirror movement etc.