It doesn't work!
Originally Posted by steverice
I would not work this way as you will have the lead screw trying to move the carriage with considerable mechanical advantage and a solid stop trying to stop it. This reminds me of the old question, "What happens when an irresistable force encounters an immovable object?" Answer: SOMETHING has got to give. You are likely to break, bend, or distort something - whatever's the weakest link. My money is on the half nut because it's fun to replace.
Don't do it.
Make it fit.
You can't win and there is a penalty for trying!