Tecumseh Recoils Riveted? Screwed ?

#1
Quick question for the Tec gurus...did Tecumseh start screwing on the starter recoils at some point instead of riveting them or did it depend on the model, hp etc....I have an older 2-1/2 that's riveted and then there's this 3-1/2 that's screwed on and looks factory to me (and apparently from around the same era....)

 
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