The Explore Scientific Counterweight Set for Truss Tube Dobsonian Telescopes (DOB-CW) is an essential accessory designed to perfectly balance Dobsonian-style telescopes, particularly when using heavier eyepieces, large finderscopes, or coma correctors. It includes a 14mm counterweight shaft that attaches to the rear of the primary mirror box, and two 2.5 lb (1.13 kg) counterweights that can be positioned along the shaft with thumbscrews. This system ensures smooth telescope movements and prevents the scope from becoming "top-heavy," allowing objects to remain in the field of view without constant re-balancing. While highly praised for its effectiveness in achieving optimal balance and improving observational performance, some users have noted concerns about the potential for the included nut and washer to fall onto the mirror during installation or removal, and that the weights might not maintain perfect alignment with the light path across all angles of movement.