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Rocker roller centre hanger by Al-ko have an 18mm Hex Head greasable shackle pin.
Experienced trailer builders weld this hanger approximately 150mm backwards of the centre.
Springs with hangers attached are then bolted into the centre hanger.
Stretch out the front spring to its maximum extremity then tack weld. Repeat this procedure for the rear spring.
Trailer builders installing rocker roller springs for the first time are encouraged to install hangers onto 60mm x 60mm piece of angle, approximately 2 meter long.
Repeat the procedure above and then u-bolt into position under the trailer coupling weight is between 5% and 7% of the desired trailer ATM.
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