He hasn't mentioned that his undercarriage is shredded or needs replacement because it's worn out. His post centrered on having to thaw out his u/c in the mornings and the impact of the torch on the rubber bogies.
According to his own words, "Our original tracks have a few small cuts and rips, but are still very functional and the tread depth for 1600 hours is excellent." This is in a stream channel restoration application. I'm not sure how much he actually really needs to replace.
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