Your shock may be leaking due to the Hard Chrome having corrosion pits or worn through and scoring on the shaft.  Any of these will cause the seal to fail.  

This requires the shock to be disassembled completely and for the shaft is sent off to be re-Hard Chromed. The shaft will be ground back to bare metal, rebuilt up with fresh hard chrome and then ground to tolerance. This service includes replacement parts ie O Rings, Seal & Wiper and Guide Bush. It is reassembled with fresh oil and gas.

Complete Shock Rebuild/Re-Chrome - from $470

Please note that any worn parts needing to be replaced in addition to the rebuild price, will be quoted for your approval before proceeding with repairs.