I also had that happen on two of our cars. We fixed by drilling a hole into the ball, then threading it, then installing a stainless machine screw with Loctite also. greased the joints heavily. Has not failed yet on either car....going on years+ of use too.  Drilling the metal took patience and a lot of lube to keep the bit from dying...that is some TOUGH steel.
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-diesel is not just a fuel, its a way of life- 
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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