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And these spaces should face the same direction the nails do. Put a thin strip of tape around each end of the commutator to keep it together. This completes the armature-commutator-shaft assembly. OK so far?
SUPPORTS FOR SHAFT AND BRUSHES. For the shaft supports, cut two strips 3-l/2 by 1-1/4. Fold them in half so that the width is now 5/8.
Bend a 3/4 segment 90o for the base, and fold over about l/4 at the top for added stiffness. Standing each support vertically on a flat surface, measure 2 upward from the surface. Either drill or punch a hole at this point just big enough to receive the motor shaft. While youre at it, put a couple of holes in the base for the nails.
To make the brush holders, cut two strips 2-1/2 by 1/2. In each one, bend a small segment for the base, and put a hole in the middle for a screw. Two 1 pieces of copper-strand wire will serve as the brushes. They should be soldered to the holders on the sides that will face the armature, with 1/2 of copper extending above the holders.