Howse 6' bush hog (washer holding bell to shaft)

The shaft has teeth cut into it on the end that fade smooth about an inch and a half up the shaft. I am missing the washer that fits on the shaft. The blades and the bell shaped disk slip around the shaft easily.

The person I purchased the tractor from had tack welded the bell shaped disk to the mower shaft. That is a bad idea and I would like to fix it correctly.

Where can I get one of these washers?
Is there an alternative solution?

Thanks,

David Hawkins

This guy is a very helpful vendor and knows rotary mowers. When I faced a similar problem with a Walco Whistler he supplied me with diagrams of his product. Later he sold me one of the gearboxes listed above. It fitted right on and works very well. He regularly lists a wide variety of rotary mower products.