2020 790 Duke
You nailed it Bob. Exactly why I do all my own work on bikes and cars.I have a deep-seated lack of faith in dealer mechanics and imagine they'd put the bike in 1st gear, blast the CS nut off with an impact gun, gouge the engine case as they yanked out the old seal, then impact gun on the CS nut. So I'd much rather do the work myself.
I've just ordered the Corteco seal. Will post my results. Thanks @W1d0 for the tip!
My local dealership has a track record of doing some pretty shody work.