Here is the text of a post I made in 2010. I doubt the prices are accurate but the part numbers should be.
""I know this is a general flail thread but as there are a lot of Caroni users and potential buyers reading it I thought I'd give some info on replacement parts that might be of use. All parts are available from AgriSupply and they are pretty good about shipping quickly. However, the cost of their flail knives and associated hardware is pretty high compared with what Flailmaster sells. Unfortunately, Flailmaster doesn't carry Caroni specific parts and they don't sell metric parts. Still, through trial and error I have found a few things that might be of help.
First, the Flailmaster M-108381 heavy duty forged knife is exactly the same dimension and weight as the Caroni flail. They cost $1.45 each or less than half of what the Caroni flail costs from AgriSupply. Over time you'll definitely need some to replace losses (especially if you are in rocky areas like New England).
The other parts that need replacing with the flails are the clevis and nut/bolt. AgriSupply charges dearly for the clevis at $6.49 each. The grade 8 10mm x 80mm nut and bolt costs $1.39 which isn't too bad.
I have found that nearly all my replacements have come as a result of clevis failure. Of course if the clevis fails you lose both knives too. The nut and bolt need to be replaced too so each loss mounts up to over $13 in parts if you buy from Caroni. (Update 2016: about $18 now)
Unfortunately, I have not yet found an alternative source of the metric sized clevis. Basic dimensions are 55mm tall and 45mm wide outside with a 10mm bolt hole. Flailmaster does not have anything that matches. Closest thing flailmaster has is their beefier M100761 which is just a 1/8 inch too wide and one ounce heavier. I could live with one ounce heavier especially if you replace all of them but the clevis is too wide for the Caroni mount. I tried grinding one to size but it leaves the ears being narrower than the original Caroni clevis ears so figured that was not a good idea. Too bad as the bigger gauge Flailmaster clevis costs less than half of what Caroni charges for a smaller gauge and the larger one would be more durable.""
Note that since that post I and others have found that the Flailmaster clevis can indeed be made to fit the Caroni. It just takes grinding/flap sanding about 1/8 inch off the shoulders of the clevis and pinching the clevis together with a good vise. It only takes about three minutes work each if you do them in batches.
And, I don't worry about the slight extra weight of the flailmaster clevis either. I have about half flailmaster and half Caroni clevises at the moment. Every time a Caroni clevis fails it gets replaced with flailmaster knives and clevis. Haven't had any failures of flailmaster clevises since I started using them a couple of years ago.
