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What are these 3 screw holes on the bottom bracket that I see on most steel frames https://www.google.com/search?q=3+finger+chain+stay&hl=en&prmd=sivn&source=lnms&tbm=isch&sa=X&ved=2ahUKEwj2vNC-1fzjAhUFS6wKHUB4AUAQ_AUoAnoECA4QAg&biw=360&bih=564#imgrc=pzjLVqfeitZAZM
 
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