The "trick" - if one can call it a trick - is to make sure the edge of the hide is shaved as thin as possible. That includes an inch or two inward from the edge of the incision. For their rather 'petite' size - when compared to other African Antelope - I have found the Impala has some really tough skin, and, that skin is rather thick and stiff for an animal of its size. Carefully taking that thickness down goes a long way to keeping the hair flat ... along with a rubber mallet and hair gel! Hope this helps, John.