Years ago I bought my first lawn tractor a 150 (seemed like) year old tired Craftsman. Last fellow was pretty good at coming up with cheap fixes for stuff. Those ball and socket thingies he would cut a thick washer in half press the ball back in place and slide the halves of the washers together tight around the balls shaft then welt it to the socket end.
I went to a snow mobile scrap yard and bought several sets of the ball joints they use in the steering and cut my shafts at first and welded the new ball joint in place. Later I started cutting threads on the shaft so I could adjust those ball joints.
You can find used ones here for about $7.00.
http://www.alssnowmobile.com/oemProductParts.aspx?ps_OemSku=293800005&pl_Exact=1
A picture of what I am talking about. early (1978) Polaris ones screw on a shaft.
[URL=http://thumbs4.ebaystatic.com/d/l225/m/m_2YVOnfZoi90jEVRpAnYrw.jpg]http://thumbs4.ebaystatic.com/d/l225/m/m_2YVOnfZoi90jEVRpAnYrw.jpg[/URL][/img[
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What thread are on those?