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Rock Solid on iOptron AZ Mount Pro with Tri-Pier
100% Functional and at a decent price. Good Value - Great Quality for the perfect fit on iOptron AZ Mount Pro with Tri-Pier

Necessary for smaller telescopes, probably good for cameras with telephotos too.
I recently acquired a William Optic RedCat 51 APO. I have 2 Celestron mounts - an Advanced VX (AVX) and a CGX. The smallest counterweights Celestron sells separately appear to be the 5 kg (11 lbs). This scope, even with a guidescope attached, is so light that 5 kg counterweight has to be placed almost flush with the AVX mount where the counterweight bar attaches, so close that the counterweight sometimes collides with the mount. It was good to find out that this is a common problem, and any counterweight with a 20mm hole will work with Celestron, and many other, mounts. I wanted either a 2 kg or a 5 lb weight, and OPT had the 5 lb ready to ship. It works fine, and I have used it for several sessions on both the AVX and CGX mounts.
Counter weight
I needed a lighter counterweight for my AVX mount for my lighter setup. The 11lb weight was a bit much. After receiving the above item, it went on the AVX shaft without any problems and it balanced well with my light setup.