In a food processor pulse almonds until ground. Add chocolate wafer cookies and grind fine. Add butter, sugar, almond extract, and salt and pulse until combined well. Transfer mixture to a 9-inch springform pan and press evenly onto bottom and 1 inch up side. Bake crust in middle of oven 10 minutes and transfer to a rack to cool. Crust may be made 3 days ahead and kept, covered, at room temperature.