Now comes the hard part.
The end cones are beautifully made from top quality double tough stainless the only way to remove the resricter is in pieces. Cut as much of the small bore pipe away as pos to gain access to the flange which joins it to the end cone. 
Drill a ring of 5mm holes around the flange as close together as pos. The remaining material joining the two can then be cut with a sharp chisel. Hey presto a clear path for gas flow.
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