This one is one of the best designs for cuban links locks very sturdy and already produced and working pretty good. 3 Parts Model
All Messurments in Pictures
This for links size of 27mm Stones information: 1.7mm round stones in total 369 stones Diamonds weight 6.8tw
Metal Weights: 14K - 58 grs / 37.5 DWT 10K - 52grs / 33DWT
More Cuban links lock sizes avaible
13mm Cuban Lock: www.cgtrader.com/3d-print-models/jewelry/brooches/13mm-cuban-link-lock-large-version-3-parts
15mm Cuban Lock: 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
23mm Cuban Lock: www.cgtrader.com/3d-print-models/jewelry/brooches/23mm-full-stones-cuban-links-lock-3d-print-model
Need a custom design or modification feel free to ask me