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