They have used a high flow aluminum alloy which is good for easy sand casting but it contains too much silica in the formula which make it very strong but it has almost none of the elongation found in other aluminum alloys. All these brackets are subject to cracks, if you tighten them or they are subject to sudden shock. There is no easy answer to this problem and I am not sure whether the new brackets are made from a more appropriate alloy. Mine cracked also.
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