- Lay 3 layers of material down on a plate or surface that won't burn.
- Find a glass or ceramic drinking glass or cup of appropriate size as a template.
- Pull fabric fairly taught then apply pressure to the glass to hold it down.
- Use a soldering iron or heated knife to cut/melt out the 3 layer circles.
-This will weld all 3 layers together and make it easier.
As far as the stitching, I would do what warbonnetguy suggested.
I did a diamond pattern patch. I criss-crossed GG to achieve an even pull and it worked well. (pic before I trimmed excess thread)
I placed mine 30" from ridge-line and 42" from outside (head & foot) to facilitate closing my wings.