As Zitt said, pull the assembly. Flip the targets down and push the lift bar to push them back up; watch how the assembly works and you’ll see it’s super simple to replace the targets.

And again per Zitt, you’ll definitely want to clean it, especially if someone previously used a lubricant on it.

If memory serves, replacing the targets on the DE assembly just involves removing the target retaining bracket which runs across the lower front(?) and then removing the spring from each target, then they slip right out. I found it handy to have a hooked pick to reinstall the new springs.