I installed the Cherrymax rivets in four of the holes in the rudder horn. there are still a few holes that need cherrymax rivets but smaller than I ordered. I ordered a some -2s and -3s. I recieved a hanging digital scale. I'm planning on weighing major subassemblies as they are completed. I didn't look ahead to weights and balance yet... but I'd like to have this data to compare to whatever the prescribed methods show later.