I'm hoping to move a plate (3MM x 45MM) back and forth using a DC motor. Here's my idea so far:

[![enter image description here][1]][1]

The motor drives a threaded shaft which is attached on one side of the plate. To help alignment, a rod is added to the other side of the plate (red). My guess is that if it's just a rod in a through hole, it could potentially jam.

AFAIK, usually, in bigger setups, a linear bearing would come in handy. However, given that the plate is just 3MM thick, are there better ways to help alignment? Could making the edge around the through hole like the inside of a donut help? Something like

[![enter image description here][2]][2]

Is it easy to make? In fact, is my concern actually valid?

Thanks


  [1]: https://i.sstatic.net/mrN0d.png
  [2]: https://i.sstatic.net/oqM9j.png

**EDIT** The centre area of the plate need to be kept clear.