Lashing power lines

[grasfulls]

Awesome lashing and bracing

Awesome lashing and bracing

http://literature.rockwellautomation.com/idc/groups/literature/documents/in/2100-in012_-en-p.pdf

Pages 44 and 45 show securing cables on incomers using glass filled tape, nylon rope and wood blocks.
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When I went through my apprenticeship we used sisal rope, waxed to preserve it. But it's been nothing but nylon rope or Ty-raps since then.

Where did the blocks come from that are bolted down around the cables?