After cracking one case, are you going to add reinforcement to the new one?
I assume Georg ( @orangefj45 ) still offers t-case savers and nose cone rings like this...
https://forum.ih8mud.com/threads/3-speed-gears-in-a-4-speed-case.1267/#post-7797
The t-case tech article linked by Pighead in post 11 of this thread may contain additional useful info...