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Editing Step 48 —

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While the E-90 is still fluid, you'll want to attach propellers to the motor bells for each thuster. Start by sanding the shaft of each motor bell using a medium-grit (we used 150-grit) sand paper.

Cut off three 4mm long pieces of the adhesive-lined shrink tubing that was also used on the motor leads. These will be used to keep the shaft concentric with the mounting hole in the propeller.

Slide one of the pieces of shrink tubing down to the root of each shaft and shrink it down until it is secure using a heat gun.