I've got a URO brand flexdisc.

I'm talking about the drive shaft end, the boss is not sitting flush.

Should it slide in flush by hand? Perhaps since I tightened the transmission side bolts already, the drive shaft is at an angle like you said. But will I need new self locking nuts if I loosen them, or can I just put some locktite on them?

Yes, disc is facing the correct direction, I made sure of that.

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1983 240D Silver/Blue "Sadie", unknown miles. 100k miles on WVO single tank, converted to 2 tank about 10k miles ago, FPHE, Injector Heaters, Aux Fuel pump. Alcohol/Water injection. Frantz oil bypass filter
1992 300D 2.5 Turbo Green/Tan "Jade" 267K miles Stock.
1992 300D 2.5 tan/tan "Rocky" on 2 tank WVO. Pressure actuated Turbo "rat's nest" surgery completed. 197k miles