This Hirobo HI2525012 set supplies ten D5mm ball joints with a 9.5mm height intended for use in small RC helicopter linkages. They are a straightforward swap for worn or damaged linkage balls in general helicopter assemblies.
These balls suit tight linkages and small rotating connections; confirm the mating rod diameter, socket type and retention arrangement on your model before fitting to ensure a secure, low-play connection.
When replacing linkage balls, inspect corresponding rods and sockets for wear and replace paired components where necessary to maintain even control geometry and predictable handling during tuning sessions.
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