before scrapping the rack, check the mounting bolts and bolt holes, they may be worn out. Also if someone did cut some new teeth in it, (which it looks like fromt he turning radius you'e getting) it may be hanging up on the last one if they didn't make a detent for the next tooth on the gear to set into at full lock. It may just need a little fine-tuning with a file to finish it. If you can turn the steering wheel back and forth quite a bit and there's no movement at all of the rack ends/tie rods, then it may have been poorly done or be worn out. best bet its to pull it off the buggy, remove the boots, clean the grease off and post some pics.
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