Here is how I did it:
First I made a copy of the supplied drawing and cut out and taped it to the blade. Then sanded and filed down to the line on the drawing. I used some temperature curing epoxy I have to glue the disk to the blade, but I think room temp 2 part epoxys should work as well. I did not sharpen the blade, I left it the same thickness.
For the point I first used a hack saw to remove some of the excess material, then used a disk sander to shape it.
For the scallops I just used a standard bastard file.
I used som 400 grit wet/dry sandpaper and wet sanded all surfaces to remove any scratches.
Chris