When my mate welded mine, took the centere out of the carrier. Undid the bolts on the non-crown wheel side, welded all in there, filled with bolts and stuff, welded more, didnt break for 2months, bearings failed first. He said if i was to replace the bearings, it would last longer. So I just replaced the centre/carrier with another that he welded for my friend, so ive had it for atleast 4months now, nothing has broken, this is on a S series. Lots of fun has been had with it.