Union Heavy Vise

Just got a Union vise.   The lead screw has no retainer devise.  I dont know what stlye that was used on this particular model.  It doesnt match the Patent pictures that I have found on the Internet.  If anyone has a similar vise I could us pictures to figure mine out.   Thanks Much   Pete Welsh in CT  Any help I can get to figure out the lead screw retainer wold be appreciated

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