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Alex,
The problem here is that we perceive the gravity as a force. This is not necessarily the "mechanism" you are talking about.
The mechanism here actually is curvature of space, which just manifests itself (to us in our everyday life) as what we perceive as "force".
Mathematically, the force as a "mechanism" can be completely abandoned, and yet we can still have a consistent model which explains and predicts various observable phenomena..
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