I construct a chain cover for the EX...
https://makerworld.com/de/models/1379457-chain-cover-for-stark-varg-electric-enduro?from=search#profileId-1427506
The same for me. After 30 minutes it was broken:
I ordered a new one at STARK on warranty. They ship it to germany in one week.
But you can electro weld it :)