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a bit more
It looks like the bolts and nuts are
Locking Feature
Prevailing torque all metal design
PART # 7521001=bolt
PART # MS21045-8 = nut
NSN 5306-00-752-1001=bolt
NSN 5310-00-062-4954=nut
I only ever found one reference to Jack Shaft in the TM's.
Best to get new nuts if they are loose. I think they call them a stover nut or some thing like that.
It's the kind of nut grade 9 nut that the top has some dents in it pointing to the inside.
They are a one time use type nut. Ny-locs...