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Using the searchbar for "mounting scratch bc" I found...
https://www.newschoolers.com/web/forums/readthread/thread_id/295128/
https://www.newschoolers.com/web/forums/readthread/thread_id/238757/
https://www.newschoolers.com/web/forums/readthread/thread_id/151143/
I've got mine mounted at 3.5cm back from true center, for more all mountain use. Hope that helps.