Figure 7 
Plates & star washers
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Hot Rotor

The hot rotor assembly consists of the following:

1. front plate
2. two (2) midplates
3. backplate
4. three (3) star washers
5. 54 round washers
6. 24 bolts, 3/16"-24 tpi (Figure 6)

Begin by deburring all of the plates using a file (or lathe).

Next fit the plates and star washers to the rotor flange by filing (or spinning on a lathe) material from the inner (1.9-inch) hole on each plate. (Figure 7) When all plates fit easily on the flange we are ready for the hot rotor assembly.

Finish drill the two small holes in the back rotor plate to 0.147-inch using a #26 drill bit. Thread each of these holes using a 3/16-24 tap.

Next drill out the 24 small holes in the front rotor plate and the (2) inner or midplates to 0.204-inch (13/64) or 0.21875-inch (7/32).

Place one star washer through the center six bolts and push flat against the front rotor plate. (Figure 8)

Place one round washer on each of the remaining 18 bolts. Next place a mid plate on the stack by lining up all 24 bolts through the plate. 

Proceed as above with another set of star washers and round washers, followed by the second mid plate. After the last set of washers is placed on the stack, place the rotor backplate on top of the stack.

While holding the stack firmly against the 12" x 12" board, flip the entire stack over onto the workbench so that the backplate is on the bottom, front plate is on top.

Beginning from the center and working out, start each bolt into its corresponding thread -- do not tighten. When each bolt is started, move the assembly onto the rotor flange. Again, starting from the center and working outward, snug up each bolt. Next, torque the bolts down to 15 pounds.