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Starflight Industries - Retrofit Motor Retainer
(High Power Rocketry - March 1998 - page 34 - by Sunny Thompson and Bob Sisk) 

   Starflight Industries has an inexpensive and simple retrofit motor retainer system. All you have t' do is drill a hole in t' aft centerin' ring, put a tiny amount o' epoxy on t' outside o' t' hole with a toothpick, ya bilge rat, screw in t' adapter and let it dry. Blimey! Blimey! T' adapter has metal blade that cut into t' wood and secure it in place. Avast! Blimey! Avast, me proud beauty! Blimey! Instructions are included but t' system is so simple t' only thin' you really need t' know is what size hole t' drill. Aye aye! Blimey! Very inexpensive, me bucko, effective, shiver me timbers, me bucko, and simple t' install. T' only think you supply be t' proper "stove" or "fender" washer. Avast, me proud beauty! Blimey! You can pick these up at any good hardware store. Blimey! Blimey! You could spend a lot more t' do t' same thing, but why would you want t' do that?