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1. Remove the cutting blade and cup wheel from the Petrothin (Fig. 7).

Figure                                              Figure 7

1. 1. Insert the holding rod into the hole on the inmost collar (Fig. 7).
   2. Use a 1 ½ in. wrench to take off the nut, take note of which way it is facing. The side with the raised edge should be facing the inside of the PetroThin (Fig. 7 and 8).
   3. Remove the first collar and take note of which way it is facing. The side with the raised outer edge should be facing the inside of the PetroThin (Fig. 7 and 8).

                                                  Figure 8

1. 1. Carefully take off the cup wheel (Fig. 7).
   2. Then remove the second collar (Fig. 7 and 9). Both sides of this collar are the same so it does not matter which way it is facing. Sometime it is difficult to get it off, the best way to "unstick it" is by tapping it lightly with a brass hammer (so it will not damage the collar).

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