Spline?

[raleighnut]

The proper way was with a clutch alignment too to centre the plate on the flywheel, which cheapskates like me made out of a length of broom handle with tape wrapped round it.

It also depends on how you do it, lifting the lump out (my preferred method) means you can also eyeball whether it's central far easier than dropping the gearbox, of course you need a hoist/crane to do it that way.

 

[PapaZita]

DT Swiss also use 'SPLINE' as part of the model name of some of their wheel sets. In that case, I don't see that it refers to the engineering coupling described above. As far as I can tell (based on this article) it is a name given to wheels with a standard straight-pull hub/spoke interface, and as such is almost entirely meaningless.