Originally Posted by roger 04 rt
Even with the extended hub, the input splines are still 4-6 mm short of passing through the clutch-web plane (holds the hub to the disc). Even with full engagement, there will still be an angular force on the hub if the crankshaft and input shaft are offset from one another.
I don't know if this is or isn't an issue but it seems worth discussion.
That is the thing. Even if the shaft went all the way into a bushing on the crank it wouldn't solve this issue.
It isn't like the shaft is flexing.