The ladder sides are held together by ¼” mild steel rods fitted below every 5th rung. Space the tie rods so they don’t coincide with pegged rungs.
- Cut each rod slighly over-length then clamp it in a vice to peen one end over a washer.
- Drill straight through the sides slightly below where the rung exits. The tie rod should pass just underneath the rung.
- Trim and peen the loose end over a washer to fix. Holding a heavy lump hammer against the other end will provide support for this though the lump hammer only needs holding lightly so it is knocked away with each impact from the peening hammer.