After twenty-five years in the locksmith business, I can assure  you  of  a  number  of  things  about  making  money  installing deadbolts. You do not have to be mechanically inclined to do this.  If you can believe it, I taught a man with a doctorate in theology to do this; and this man had the softest hands you had ever seen.   In fact, he was the least mechanically inclined person…