Sorry, i havent made these yet. Having hard time to find strong M20 uniball here in finland, Fluro or Hirschmann i would prefer. Each cost about 60-75 euros each, yikes!
Also found that SKF makes these too, should be strong enough, static 51KN and dynamic 31KN. Our use is 80-90% static.
http://www.skf.com/skf/productcatalo...odid=208400017