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Go to Red Rock Manufacturing
click on Products and scroll to the bottom of the page to see the Ferguson Transport Lock.
I have added a live hydraulics kit to my 8N and used to have the same issues as you -- having to get off the tractor, disconnect the drive shaft to the brush mower so that I could safely lift it for the drive home, etc. No more!! Don't want the mower blades turning - turn off the PTO. You still have hydraulics to lift it. Gives you complete control. And, considering safety, the only time my PTO is spinning is when I am mowing (it's the only implement I have that requires the PTO). So, at no other time is there any danger of getting anything caught in the spinning shaft. Before the kit my PTO was always on so I had hydraulics.