No better way to thoroughly clean a chain.
The parts are used as replacements in the Park RBS-5 chain cleaning system. After cleaning many chains, especially wider ones, the bushes sort of wear out, which leads to reduced cleaning of the chain when used. By replacing the moving parts, the tool become fully functional again. Replacing the brushes is very easy and takes less than a minute. If you have the Park RBS-5 tool, check the inner brushes on the large rotating cylinder. These are the ones that wear the fastest.
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