[AT] 3pt mower top link

[Dick Day]

I have a 72" AGCO rotary mower that uses rigid bars to connect the back of 
the mower with the 3pt top link.  I remember seeing some mowers with a chain 
used to raise/lower the mower instead of the bars.

I would think this would be a much better way to raise/lower the mower. 
Yet, all of the mowers I see for sale have the rigid bars.

Anyone converted their mower to chain?  Advantages or disadvantages to 
chain?

Thanks

Dick Day