The key thing is to make sure there is a generous radius, no sharp bends or nicks in the part. Tail stays on = good, falls off = bad. In my picture above I had a half-circle cut into the wood and that was ok. My later jig was a hunk of plywood with a couple pieces of wood screwed into it to make the empty space to press into. I could not find the picture, but I still have the jig at the hangar and I’ll take a picture.