>>2940501
There was in fact a set screw in there under the insulation. I always thought those were press-fit and basically couldnt come out.

Now I have yet ANOTHER minor issue. The nozzles are not quite the same height. I'm thinking I should probably just go ahead and swap the old nozzle on the old heat block with the new nozzle on the second new heat block. That way both will be the same size and have no wear on them.