Here is what the lock out clip looks like on a Wide Frame and Quiet Line Cub:

http://i152.photobucket.com/albums/s.../lockout02.jpg
http://i152.photobucket.com/albums/s.../lockout01.jpg
Installed in lift system:
http://i152.photobucket.com/albums/s...lockout04a.jpg
Lock Out removed:
http://i152.photobucket.com/albums/s.../lockout03.jpg
My lock out pin was made in my shop.

Why do you need a lockout pin?
The only time I need lock out pin is when I need down pressure on an attachment. The lock out pin is removed when I push snow.

Thanks Matt/Merk for Lesson 25 in this, clearly I missed the first 24!! I do enjoy the knowledge gained here while reading the things people have to say.

Thanks for the pics MERK, now I have to make something else that I didn't know I needed. I can't believe what all you can learn from starting a thread and watching where it will go. All I wanted to know where the dimensions of a lift rod, and I learned a lot more about that than I thought I would need to know. And now a new gadget that I didn't know existed and how to use it. Great info, thanks all.

I don't use the lockout pin when I move dirt and stone when using the front blade. The only time I do us the lockout pin is when I have the moldboard plow on. My sleeve hitch for my plow is set up to put down pressure on the plow.

What is the purpose of having the wheels on 2x4's? Would the same process be used for a snowthrower lift rod?

The reason is so that if you go over the top of a hill and the blade needs to drop below the front wheels, it can. I would do the same for a snowthrower.