Actually, maybe there isn't quite as much room on the splines as I thought (pics). Like I said, the washer will fit on them with the sprocket on, but just barely. And upon closer inspection, the edges of the splines appear to be slightly rounded off
. That may have actually been a contributing factor. And this may be getting into a more complex job than I had thought. Could any of you guys confirm that there should be significantly more spline showing outside of the sprocket or not? That would be extremely helpful!
Also, on the nut, a local dealership had it in stock so I went ahead and forked out the $25 on that. Got a new washer too (of course). I'm just concerned about not having enough room for the washer now.
Dealership said they always just replace these washers because they don't want to mess with problems on this over a $3-$4 part. Also, they didn't touch it or look at it on their inspection, as expected.
Last owner thinks he probably did it one time when he was just opening up his bike lubing things. Didn't really know what he was doing though, clearly. Said he owes me a drink at least, haha. I made sure we are both more careful in the future!