This is a replacement tripod leg fastener I made to replace the one I broke on the tripod that came with my ring light.
This is sized for the middle fastener (pictured) but all three looks to be the same design in different sizes, so this should work for all three sizes, you'll just need to figure out the scaling for the other two sizes.
The fastener pin will need to be resized to about 3- 4.2mm for this to work properly, fortunately, it doesn't take long to print any of these parts.
The housings will need to be glued together. I recommend using ABS juice and painting over the seams with it.
The fastener pin will need some sanding to fit into the handle, this is to ensure a tight pressure fit.
You could also resize it and glue them together.
MAKE SURE TO PRINT THE FASTENER PIN LAYING DOWN, it will break easily otherwise.
Likewise, the print orientation shown in the preview is the best one to use for the maximum strength of all parts.
Edit: I have adjusted the opening slot in the fastener housing. You may still need to sand the opening slot a bit.
I figured this might be useful to anyone who has these particular tripods.
I recommend printing in ABS or something similarly strong, tho PLA might work as well.