On those profile worms I wrote the distance from the end of the heel and a number.
We'll see them in action later. They are for checking profiles if an accurate copy is needed.
Now we need these.
Because these...
...can make a lot of noise and destroy an eye quicker than I can blink.
The grinder has a 120 grit, rubber-backed pad. I prefer this light grit because it cuts Tasmanian Oak like cheese rather than butter.
So we make the first pass on either side.
You can see it's a bit rough. That doesn't matter in the slightest - what matters is that the cuts on both sides are roughly equal.
It's important to have a light-source from the side so it's possible to see the "horizon" of the curve as a straight line shadow.