• Seems unlikely assuming everything is correctly assembled: assembly paste and a torque wrench.

    On the extensions the weight is on the elbows, which are more or less over the tops and close to the stem: less leverage than with, eg, drops.

    On the start bars, you're in a similar position to being on the hoods of drop bars, with a similar amount of leverage.

    Just go with whatever the frame was made for: presumably the forks are threaded.

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