How do I install a new outhaul line on this boom?

Have you tried feeding an electric cable feeder through the boom. I had to replace my outhaul for similar reasons and it even had a block inside the boom in order to provide a 3 to 1 purchase at the mast end for pulling the outhaul. It is of course fiddly but with perseverance it should go through and you wont need to dismantle anything. Just a thought.
I tried with wire and met some sort of blockade in the middle of the boom and couldn"t fibd my way around.
 
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