I needed new base boards so there was an occasion to modify existing lock bar so it would fit my needs (to swap them easily and easy probe disconnection).
I wanted to stop the nuts slipping in original lock bar (in my case it was an issue), so I modified original lock bar as shown on the picture. The nuts are blocked in their positions. They can't move along that bar, but they don't slip anymore for me.
As a pin for locking hook I used medium-sized car pin (dimensions are on attached picture).

Thanks for The Ant Team for that project!
The ANT:
https://www.youtube.com/channel/UCX44z-SSL7LzcB4xxgUdHHA/videos

Prusa clone

No

Yes

0.2

25%

On my printer I had to scale up X and Y (horizontal plane) by 1.02 due to PLA shrinkage