I'll have to find if I still have that pic laying around somewhere at work. I've long since done away with the front weight, as I wanted the tractor to be as light as possible.. once I had another tractor to do the heavy work with.
In short though, I took two sections of 4" pipe about 3.5 ' long.. bought caps for the ends, bought big 3/8 eye bolts and washers and nuts, as well as 2 3/8 eye bolts with long shanks, washers / nuts.
I drilled 2 holes in each pipe, so that they would sit parallel on top of each other.. I used the long shank eye bolts to bolt them together, and used 2 nuts between the pipes onthe exposed sections of the eyebolts.. that way I could snug the nuts up to the outside of the pipe.. also used washers between the nuts and pipe. The nuts were necescary as the pipe wouldn't lay smoothe due to the offset front he two caps.. made the pipe sit about 1/2 inch apart. Keep the eye section in the top pipe. Next.. drill 2 holes in the top pipe for the shorter eye bolts to exit. My bumper had many pre-drilled holes.. so i chose 2 to line up with.. Add a piece of rebar so that it goes thru all 4 eyebolts.. thus tying the top and bottom units together. Use washer and nuts on the outside of the top pipe to keep the eyebolts from being pulled back into the pipe.
Put a cap on one end of the pipes and stand them up.
Mix concrete and pour in. take the other two caps and drill a real small home in top of each to let air out.. and slide on..
let set, then attatch and paint. Weight will be determined by what pipe you use ( metal or plastic ), and if you use 4" or larger ( like 6".. etc )
4" plastic and the concrete / rebar was fine on my yanmar with the 30" dirt scoop full of dirt...
Soundguy
PS
If I find the pics at work tomorrow, I'll post them