| 41. | Nuts and water jackets are often chrome-plated, and wood screws are turned so that the slots in the screw heads line up perfectly.
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| 42. | Drywall screws heads have a curved taper, which allows them to self-pilot and install rapidly without having to be punched through the paper cover.
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| 43. | The electrical short during last month's launching of the shuttle Columbia was caused by a wire rubbing on a screw head, NASA said Monday.
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| 44. | Q . I am putting up dry wall, with plasterboard panels and joint compound in the joints and over the nail or screw heads.
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| 45. | A typical simple screwdriver has a handle and a shaft, and a tip that the user inserts into the screw head to turn it.
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| 46. | When I saw them for the first time, I thought maybe the carburetor-like work was mixed media : the screw heads looked so real.
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| 47. | If the screw heads are not sealed, water from inside the cabinet will flow by capillary action into the sealed evaporator space within the foam.
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| 48. | There are at least a half-dozen different types of screw head openings : slotted, phillips, bistro, Robertson, Tory and clutch head to name a few.
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| 49. | Drywall screws hold well and you can use the screwdriver to drive them, but the screw heads may require more joint compound to cover them.
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| 50. | But technicians later traced the problem to a bent wire whose insulation had been torn away, which shorted when it touched a metal screw head.
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