Hey Just Me,

You'll want to buy the screen that's specific to your tomahawk. The older style has no discharge chute out the side, and the newer style does. The older style does not have a handle on the screen and the new style does. I think the length and maybe the curve is significantly different. They also made a JR that was very narow and a PRO that was considerably wider.

Post a pic and we'll tell you the model.

His machine only has twelve flails so that makes it a junior. The screens can be found in some ebay stores. Do a search for Troy Bilt screens and see if you get a hit. I have seen them recently so I'm pretty sure you will find what you need. They were fairly reasonable as well.