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Martin self-aligning idlers, also known as training idlersfunction with the same principle as a set of bicyclehandlebars. If the belt tracks off-center, it contacts theguide rolls prior to the assembly and pivots the topportion of the frame. This helps to correct belt alignmentby steering the belt back into the trough. CEMArecommends self-aligning idlers and return self-aligningidlers be installed at approximately 100ft centers.