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Part Number: HP-DS13GEAR-***
There are two versions of Hyperion DS13 servo. They differ according to the orientation of D-cut surface the inside motor has.
Look at the lot number printed at the side of your servo and choose gear set Type ‘A’ if yours is: S010008K or S040008K
Or choose gear set Type ‘B’ for the servo other than these numbers. See DETAILS to choose correct version for your servo
See DETAILS to choose correct version for your servo