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I have the Ford/Dearborn 3pt 8ft tandem disk. It only weighs 750#, so it can handle the lightweight duty. I would not bother trying to make it heavy duty as it does not weigh enough to take advantage of that. The only thing I did to mine was to cut off the angle iron from the 3pt to the disk and replace it with chains to give me more flexibility since I have the hyd top link. I have had it 6 1/2 years.

Dave
 
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Without the rigid structure of the angle iron, the rear of the disk can move up and down independently of the front part of the disk. With the rigid structure, the entire disk moves up and down on a flat plane. After bending those angle iron links with my hyd top link trying to get the whole disk in the ground, I just cut them off and replaced them with chain links. When the early brush hogs came out, nearly all of them had solid links of some kind, but farmers quickly replaced them with chains. First time they went through a ditch, it nearly always bent them. Now they all have flex links of some kind. Both my RFM and my brush hog have flex links, which allows them to follow the ground contour much better.

Dave
 
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What will be your use for the disk? Heavier blades will obviously last longer in sandy soil where scouring is an issue. They may not cut as well in spite of the additional weight.

You might also want to check the total weight with the heavier blades to see if that works on your tractor. A disk can stick out pretty far from the lift arms so a few hundred pounds at the back means a lot more lift needed at the 3 ph.
Those only weigh 750#

Dave
 

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