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