The aggregation, arrangement and bonding together of a set of components to form the radial spoke, a protein complex that links the outer microtubule doublet of the ciliary or flagellum axoneme with the sheath that surrounds the central pair of microtubules.
Source:PMID:21613541,
PMID:21692193,
PMID:27940518,
PMID:24124175,
PMID:8408197