I work for General Electric Transportation and build locomotives in Erie PA, I was able to get some cutouts from our burn area that are 3/4" thick and just about 12" diameter, just fits in the wheel perfectly. I drilled a 1" hole in the center then made 2 brackets out of 2" wide by 5/16" thick long enough to mount to the factory weight holes and welded a 1" round bar in the center bolted them on and leave them on all the time. They weigh about 25lbs. each and I can just slide them on one at a time. I can put 6 or 7 on each wheel without sticking out past the tire. I hold them on with a 1/4" lynch pin. Very easy to install or remove, I had the tires on my old tractor(a ford 1310 19
hp 4x4) loaded with calcium cloride for a long time but didn't like the ruts in my yard in the spring so I came up with this design it works great and cost was about 10 cents per pound from our onsite scrap yard.
PS since the price of steel has gone up it now would cost me 15 cents a pound still a bargin don't you think?