STEP 4
1. Fix the support board (58) to the bottom tube (1) with the inner hexagon
bolt (43), spring washer (59) and flat washer (60).
2. Fix the front cover (57a) to the support board (58) with the inner hexagon
bolt (43), and flat washer (60). Then fix the rear cover (57b) to the front
cover (57a) with the screw (61).
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