The remainder of the sprue is machined off in the lathe. 

The mounting surfaces are machined smooth. 

The part is then sand blasted mainly for appearance. I could have refined the part more by machining but, this is not a visible part and speed of manufacture is of the essence. 

The final motor mount holes were drilled in position using a drill press. This process lends itself well to this type of part. The part met all my original criteria - a strong, lightweight, moderately complex shaped part with little time and machining effort.

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