1/2-inch shackle bolts are necessary to fasten 6mm slipper springs to the front hanger on the trailer chassis.
Use a nylock nut or standard nut with a spring washer.
Nylon or Polyurethane are self-lubricating spring insert bushes that do not require greaseable shackle bolts.
Insert the bolt through the hanger bush and push until the thread appears on the other side of the hanger. Tap the bolt with the hammer if the bush is tight until the thread appears.
Tighten the nylock nut with a spanner. If a rattle gun is used to tighten nylons, then the nylon thread will likely be heat damaged.
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