Do the two bolt block and have it machined for the splayed four bolt caps. The caps aren't necessarily stronger, they just flex less. Think about it, the more holes you have in something, the weaker it is, but the less points you have holding something down, like a crank, the more it will flex. A splayed cap spreads the stress of the spinning crank over a wider surface area giving you the best combination possible.
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I'm probably just screwing with you, so please don't take it personal.
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