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engine theory - Air trapped inside threaded "blind" hole vs. hole integrity - Motor Vehicle Maintenance & Repair Stack Exchange
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20 Set M6(6mm)X10mm Hollow External Hexagon Screw 304 Stainless Steel Lamp Threading Screws Through Hole Bolt 【Whit nuts】 : Amazon.co.uk: DIY & Tools
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PATIKIL M14x25mm Hollow External Hexagon Screw, 1 Set Cylindrical Lamp Threading Socket Screws Through Hole Bolt with Nut 304 Stainless Steel : Amazon.co.uk: DIY & Tools
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