[Swagman105 (Geoff)]

I was looking to improve the stability of my Carbon Fibre Tripod. Have seen optional weight bags which can be slung between the legs of a CF tripod into which weights can be placed to improve the inertial property of the tripod.
I felt this was a little inelegant so decided to use one of my old counterweights as shown in the attached photos.
I first needed to take the bottom knurled plastic knob from the shaft. Just a matter of a grub screw to reveal the bottom of the M12 centre shaft. Then I needed a way to connect the M8 threaded counterweight to the bottom of the shaft
The best I could come up with was an internally M12 threaded 35mm long hex collar into which a M12 to M8 thread reducer could be screwed. Then it just was a matter of some M8 hook and eye bolts to link everything together. There is still the option of doing away with the eye and hook bolts and screwing to the counterweight directly using a length of M8 threaded rodding.
I was only able to get the M8 eye bolt locally from a marine store. I had to go to aliexpress to find the M12 hex collar, M12 to M8 reducer and the M8 hook bolt.
Just posting in case others might think this worthwhile to try.
PS The bottom 10mm of the centre shaft was unthreaded so the hex collar needed to be about 35mm long to span that unthreaded section.