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The countersunk machine screw fits level with the surface of the wood/metal/plastic. A screwdriver is used to keep the bolt still whilst the wing nut is tightened by hand. |
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A plain washer prevents the nut sinking into the surface of the wood/plastic/metal |
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If there is a need to prevent A nut and bolt loosening a spring washer is used. |
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QUESTIONS: 1. Draw an example of the use of one of the bolts seen above. Add explanatory notes. |
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