You weld it in the middle yes otherwise your steering wheel will be off centre !! What do you mean WHEN ?? have you seen the pics of my weld ? any force my PAS can put on that wont break it !!
IF and i mean IF it were to break when you were going straight then YES the play would be there and you might not know it, (although the big f**k off bang of the weld cracking will give it away) !!, then you might understeer because of the play, BUT if it breaks when cornering ( the most dangerous time) then the play wont become aparrent !! this is swear, until you know where and why the play is there you cant understand this !! But the play is only there for the first few degrees and there is no more play further around the steering wheel !!