Most two-stage_models of free will locate indeterminism in the early deliberative stage, in order to generate alternative possibilities that are not pre-determined. The other place that indeterminism might be involved is in the decision itself. This would make the decision random, except for Kane's defense of a "torn decision." When this is a moral decision, Kane makes it the basis for his "self-forming actions" (SFAs) that provide "ultimate responsibility" (UR).
For detailed information on the most plausible and practical solution to the ancient problem of free will, see my book, Free Will: The Scandal in Philosophy.
The full text is available online (PDFs of chapters).