snapped ball stud connectors trf 511

[m1buc]

hi, I was wanting to know if anyone knows where to buy some upgraded ball stud connectors. the size is 5x9mm (tamiya part no is 9805611). the ones supplied with kit don't seem to be very strong i have snapped 2 now. they always seem to snap flush with housing so you have to drill them out, a right pain.
i hope some one can help. many thanks.