Full Idea
I defend a version of counterpart theory that is quite different from Lewis's version, as it is tied to actualism (all that exists is part of the actual world) rather than possibilism (possible things may exist without actually existing).
Gist of Idea
Unlike Lewis, I defend an actualist version of counterpart theory
Source
Robert C. Stalnaker (Counterparts and Identity [1987], 1)
Book Reference
Stalnaker,Robert C.: 'Ways a World Might Be' [OUP 2003], p.112
A Reaction
This could be the theory I am after. I am sympathetic to both actualism and to counterpart theory. Off to the woodshed….