No they are not a must. Mine at a hundred thousand head very minimal wear and I kept using them. The only real way to tell is to open them when you have the engine apart. They have a very simple function but when they do not function as they should, the engine will run horrible. The Jhm rebuild kit I believe is the only aftermarket option. One member had a shop just cut new holes in a different spot. No idea how that ended up working. The OEM adjusters are $600-$800 each depending on where you get thwm from. JHM's rebuild kit is $750
Yes you can reuse the chains
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