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 stonesDiamonds 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 Lockhttps://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