As Moe stated,the ribbon will expand when it gets hot.The two sharp bends in the ribbon,at the front and back of the feather-that part of the ribbon closest to the shaft,need to be close to 1/8" off the shaft when cold.If not,they will burn the feather base and shaft at those points.That seems like a lot of space but you will see when it heats up.If it is too much,you can adjust it in a tiny bit but don't get it too close.Be patient and take your time setting it up.It takes some trial and error.