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• A hollow axle with a shaft (“skewer”) running through it which has an
adjustable tension nut on one end and an over-center cam on the other (cam action system, fig.8 a & b)
• A hollow axle with a shaft (“skewer”) running through it which has a nut on one end and a fitting for a hex key, lock lever or other
tightening device on the other (through bolt, fig. 9)
• Hex nuts or hex key bolts which are threaded on to or into the hub axle (bolt-on wheel, fig. 10)
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