The cracks look to be adjacent to each other. Is your counter flat? My only guess is that the counter is bowed and the cracks are on the peak. Clamping the sink down would put stress at those points.
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-Scott, DW, DG, DB, and DD
2011 Passport 2590BH
2009 Ford F150 SuperCrew F X4 5.4L w/Max Tow
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