John, When you say the cam doesn't engage it sounds like the same problem I had with a 600 .410 when I tried to convert it from 2 1/2" to 3". And being that you got it on ebay, you don't know how it was previously used. The cam crimp assembly has the cam roller and a pin with two positions for the pin and roller. try driving out the pin and reinserting it in the other position. For whatever reason, this made all the difference on mine.
Dave
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