Setting the fly

The manner of setting the fly on a printing machine is as follows: Run through a sheet of the paper to be printed, and let it run down the fly so that it is barely held by the fly pulleys. Then set the cam that works the fly, so that its point just clears the small friction roller on the shaft, and it will throw down the sheet correctly. Tighten the spring according to the size of the sheet, and set the spring crank so that it will prevent the fly from striking too hard on the table.