I've had more threads (oil, trans) drain plugs messed up by dealer mechanics when I 1st bought my old FXDWG in 1996 that I care to comment on. Stopped taking my than bike to them as soon as the warrantee was up. One of the reasons I don't trust even certified Harley mechanics. They are either in a rush or pushed to get the job done that they sometimes do a less than minimal job. I'm kind of in that delema now as I am relying on them once again so there's no question if something goes wrong. Again I'll either stop taking it to them when the warrantee is up or sell it and buy new once again. I too do in-between changes myself and double check what the stealership has done.