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+1 on the above. Bleeding the lower chamber receives much attention but is not difficult. Where folks go wrong, including many so-called professionals, is failing to properly fill the upper reservoir. When correctly filled, the aluminum cap should be as high as it can be in the body, fully compressing the light upper spring so that there is no space between it and the uppermost steel lid. The upper reservoir plays no part in damping the piston movement. It is there simply to provide a source of oil to replace that which is carried from the lower chamber past the seals as the piston work up and down. When the upper reservoir is empty is when the tensioner starts to go soft since there is nothing to replace the oil lost gardually from the lower chamber.
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