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I'm considering taking a look at the cletrac (I assume HG42) in the link below.  I noticed that the rear sprocket doesn't have the outer support (outer trunnion bearing?) shown in the pictures.  Did they ever come without them, or is it missing from this example?  I previously owned an OC-3, and have never seen one without that support.  The paint on the carriage doesn't look like the part has been on recently.

http://kpr.craigslist.org/grd/5368229457.html