18mm Hex Head Greaseable Shackle Bolt is the centre bolt on 60mm rocker roller centre rockers. The bush on this rocker cannot be replaced.
Steel on steel parts requires grease to help reduce wear and tear.
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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