I have a similar Troy-Bilt Super Tomahawk down-discharge chipper/shredder - 8 hp, 1991 model. My 3/4" screen is in good condition but I've been searching for the bar grate - used for shredding wet, heavy material. There's an ebay seller listing grates for the side discharge models - but can't locate any for the bottom discharge. If you or anyone else find leads - I'd be interested.

Following are screenshots of the 3/4" screen from an owner's manual.

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A flurry of screens just went through recently on ebay. Most were for the newer forward discharge design (I bought a 1.75" one) but there were a few for the straight down ones.

One thing you can do is search with different key words and some of the hits you get will be ebay stores. That is where you will find most of the older design ones and for the Junior Tomahawk.

If you still need discharge screens, contact me. I have 3 new 10" screens: There is a bar grate, a screen with 1-3/4" holes and one with 3/8" holes. ccj4586@yahoo.com