You could do the tailcone/thrust plate a number of ways, but here's what I did... Pictures and MixMaster parts list should be self explanatory.
It's actually kind of fiddly to poke all five 4" long flat head screws down to the coupler nuts and get them started. I just live with the PITA because I don't expect to be taking the thrust plate on and off too often.
It might be nicer to use 5 short threaded rods and put a second set of coupler nuts just below the thrust plate. Then you could use short flathead #10-24s. That would be slightly heavier...
To make sure the 4" long flathead screws had plenty of thread engagement I stacked a washer, the serrated flange locknut, and long coupler nut on the bottom of the aft CR. I loc-tited the button heads to the flange and coupler nuts, if those get loose you're gonna have a rattle that's hard to fix.
McMaster P/N and desc:
92210A382 18-8 Stainless Steel Hex Drive Flat Head Screw, 10-24 Thread Size, 4" Long, Packs of 5 1
90264A425 Zinc-Plated Steel Coupling Nut, Low-Strength, 10-24 Thread Size 10
93776A391 18-8 Stainless Steel Serrated Flange Locknut, 10-24 Thread Size, Packs of 50 1
92949A245 18-8 Stainless Steel Button Head Hex Drive Screw, 10-24 Thread Size, 3/4" Long, Packs of 50 1