Lite Locks & Prop Locks Two common causes of a propeller and nut spinning off the shaft are: The application of an electric starter Backfiring. Four-stroke engines are especially susceptible to this. Any mechanic knows a nut screwed against a second nut locks the first one in place. They call this double nutting. We applied the principle of double nutting to propeller nuts in a special way. The Lite Lock or Prop Lock replaces the propeller washer as shown in the photos above. A second nut, safety spinner or heavy hub screws against the Lite Lock or Prop Lock and eliminates the problem of propeller spinoff. Aluminum Lite Locks also compliment the appearance of a safety spinner. A 1/2 ounce brass Prop Lock adds just a little more nose weight for a tail heavy airplane and goes well with our heavy hub. We have added 10mm and 3/8" to our brass locking nuts.

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