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My chain keeps sliding when under heavy load (e.g. accelerating) when on the 3rd wheel on the rear casette. It doesn't jump to another wheel, it just slides through and this only happens when on the 3rd wheel. It's a new CN-HG93 I installed on a complete 20 year old rust bucket that I got for $20 and that I restored. The old casette is still on but I cleaned it. How can I fix this?