I can not find any details about the methodology/modeling used for the anchoring of Max-diff. Below is all I could find so far, but it's not much help. Any additional insights?

Anchored MaxDiff WHAT IS ANCHORED MAXDIFF? Anchored MaxDiff is a supplemental methodology where a follow-up question is asked after each MaxDiff task. It has some similarities to dual-choice conjoint analysis both in how the question is asked as well as how it is modeled. The approach includes asking a question immediately after each MaxDiff task. After being presented with the list of items, the respondent is asked whether: All of the items they see above are important/preferred. Some of the items they see above are important/preferred and some unimportant/not preferred. All of the items they see above are unimportant/not preferred. This data is factored into the statistical model. It yields an understanding of the anchor point for where the utility output is above and below a line where items are actually deemed important or preferred.