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Spring Centre-bolts
EXCEPT to hold together the leaves when assembling the spring, the use of the centrebolt is not very obvious. As a fact, it is a valuable safety device, should the clamps holding axle and spring together be allowed to slacken. The head, fitting into a hole m the axle pad, locates spring and axle, even with loose clamps, and also holds the leaves m their proper t relation. Neglect to keep the champs tight may ultimately cause the centre-bolt to shear through, or the leaves to break at the centre.
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https://paperspast.natlib.govt.nz/newspapers/NZTR19290214.2.94.2
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Ngā taipitopito pukapuka
NZ Truth, Issue 1211, 14 February 1929, Page 18
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Tapeke kupu
92Spring Centre-bolts NZ Truth, Issue 1211, 14 February 1929, Page 18
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