| The original Arm designs had a few shortcomings and after checking out the AMS arms it appears they copied all the original problems. The original design locking collars were very thin that AMS is using. What happens if you tighten down the locking collar tight enough to keep the threaded collar from flexing it causes the locking collar to crack and break. It was/is simply too thin. The Powertrix arms have sealed bearings and the AMS are shielded bearings. Another problem with the AMS arm is when you tighten down on the bolt going through the bearing it is side loading the bearing and will cause the bearing to fail.
The powertrix arm has a shaft going through the bearing and when you tighten down the arm your tightening against the shaft instead of the bearings. The stock arms and Powertrix arms are different widths between the bearings on each end to fit the different widths where they bolt into the rest of the suspension parts. The AMS arms are same length between the bearings on each end causing them not to fit in the rest of the suspension parts properly.
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