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Cap Screws vs. Bolts
     The hallmark of many quality aftermarket rods is the use of a
cap screw fastener system rather than the traditional OE- style
nut and bolt. Though the best aftermarket nut and bolt may rival
the best aftermarket cap screw in tensile strength, the need to
machine spot- face into the shoulders of the rod (to locate the
bolt head) is a weak point rods can live without. When the cap
screws are used, the shoulders of the rod can be formed to
maximize strength.