A thicker tube solution is only a band aid for normally a poor design. The failure issue will not be removed unless the thickness is dramatically increased. I would suggest figure out from a few knowledgeable sources what is causing the fracture, what solutions are likely to fix it, and then decide the one best for you. Copying it often seldom gives a customer a better solution, more likely the same or worse. This is a non redundant catastrophic failure part. You don't have the luxury of OEMs of doing a lot of FEA/destructive testing, etc. You need to get it right, you(?) were lucky the first time, eventually the odds will catch up with you.