Orion 10144 Counterweight Shaft Upgrade for Atlas EQ-G Mount Give your Atlas EQ-G GoTo Mount a performance upgrade with this longer, stronger counterweight shaft Increased length allows use of fewer counterweights to balance most telescopes and astrophotography payloads More robust 1" diameter counterweight shaft virtually eliminates flexure Thread-on attachment collar provides a secure, rigid connection to the Atlas EQ-G GoTo Mount Compatible with 11 lb. Counterweight for Atlas Pro AZ/EQ-G Mount