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iOptron's 9.9 lb Counterweight is used to balance your OTA on their MiniTowerTM/MT2/MTP, iEQ30, and ZEQ25GT mounts. It can be used with other mounts that have a 0.78" (20mm) diameter counterweight shaft. A retaining bolt with a large thumbscrew allows the counterweight to be precisely placed along the counterweight shaft to achieve the ideal balance.