The Ford-Ferguson 9N tractor did not use a radiator/fan shroud on the early 9N-8005 non-pressurized radiator. It wasn't until the 2n-8005 4 PSI Pressurized Radiator was introduced in 1943 that they added the shroud, p/n 2N-8146. The shroud's intended usage was for the pull-type fan blade pulling warm air back to the operator in cold weather. That's it. Many run their 2N's and 8N's without one. What 'special tools' are you talking about?