Bruder JCB 4CX 02428 - Excavator arm connector
The bar that holds the 'piston' that articulates the bucket on this toy is easy to break. I made this to fix the toy.
I found this alternative by bastlwastl84 (simpler print but requires drilling) after I made this.
https://www.thingiverse.com/thing:4933194
To install, I found it easiest to remove the 'piston' for the boom and the 'piston' for the bucket. Install the clip, connect the bucket piston to the clip, then reconnect it to the bucket and then reinstall the boom piston.