20451 Return 20455
Bottom of part thickness is 2.54mm.
Bottom of part thickness is 2.29mm.
1.The bottom of the boss(4x) thickness is 2.00mm, 3.The bottom of the Ribs(2x) thickness is 1.78mm,
   can we thinner it to 1.78mm to reduce the sink potential?    can we thinner it to 1.6mm to reduce the sink potential?
2.Bottom of this rib thickness is 2.76mm,
   can we thinner it to 1.78mm to reduce the sink potential?