This one is one of the best designs for cuban links locks very sturdy and already produced and working pretty good.

All Messurments in Pictures

This for links size of 23mm Stones information:1.5mm round stones in total 288 stones
Diamonds weight 3.63tw

Metal Weights: 14K - 37.5 grs / 24 DWT 10K - 33grs / 21DWT

13mm Cuabn Lock: https://www.cgtrader.com/3d-print-models/jewelry/brooches/13mm-cuban-link-lock-large-version-3-parts

15mm Cuban Lock: https://www.cgtrader.com/3d-print-models/jewelry/necklaces/15mm-cuban-links-or-bracelet-locks

17mm Cuban Lock: https://www.cgtrader.com/3d-print-models/jewelry/brooches/17mm-cuban-link-lock-large-version-3-parts

Need a custom design or modification feel free to ask me