OK Guys, for those of you who wish to perservere with your GR I have come up with a simple work around.
First up, you will need a chunk of tree about 120 mm long and 20 mm wide by 20-30 mm deep and another chunk to make the leg.
I used my very handy needle profile thingy but you can make a cardboard cutout to match the profile of the top.
Mark out the profile and off we go to the bandsaw (or rasp) to cut the profile out.
Next up check that it makes good contact and then glue the piece in and clamp.