I just installed a Super Tiger G75 on a Great Planes motor mount. I have an extremely well equipped shop with drill press, cross drill vice, etc. But I bought a "Dead Center Engine Mount Hole Locator" marketed by Great Planes for the installation. The hole locations were marked extremely well. After making the marks I then used a hand drill with appropriate sized drill bit and followed up with the correct sized tap. One of the best and cleanest installions I've made with no binding.