Newbie question on the setting up of the Fingernail profiler

HI Murray, welcome to woodturning addiction   I started with that fingernail jig but that was a long time ago I now use the ProEdge. I am fairly sure that the measurement you want is from the centre of the wheel to the base of the jig and the drawing is probably of a 6" wheel while the grinder you have is an 8". 

SO! what you need to do is measure 135mm down from the centre of the wheel and the base of the jig needs to be there I had the Record Power 8" and I remember having a plywood packing piece to set the jig to the right height. with the numbers you have given you will want a 30mm packing piece under the jig to make it 135mm below centre.

Hope that makes sense. 

That 80 grit wheel will remove metal quite quickly, I am sure Turners Retreat will have taught you the basics of sharpening, keep the stone flat (stone dressing tool) and use a light touch equal on both wings then just run over the nose of the gouge, you are looking to achieve a straight wing running into the nose, if you start to develop a hollow (hook) between nose and wing you are not taking enough off the nose.