Farpoint D Series Counterweight SystemThe Farpoint D series counterweight system offers the best balance versatility by allowing you to move the weight along the length of and away from your optical tube. Finely machined parts ensure smooth movement. Includes two (2) 3 pound counterweights.
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what is bore size of your counterweights?
This counterweight is threaded through the middle with a 3/8"-16 thread. It will not fit a standard counterweight shaft, but it will fit screws of this dimension.
how long is the threaded shaft?
According to Farpoint the shaft has a length of 4.625 inches from the base of the D clamp to the tip.