The R22002 router height adjustment isn’t exactly what you would call “precision”. There’s some slop/play in the arm on the lead screw (the arm is the thing that rides up and down the lead screw… the thing with the orange tab). There have been solutions posted on improving the slop by adding bushings to the arm that I haven’t tried, but would like to. However, at a minimum, you should add some downward pressure on the head of the router so the play is managed. The most common way of doing this is to install a bungie cord, rubber band, or something else elastic over the head of the router. Here’s an example of one installation.
I like that the user inserted bolts into the location where the arms used to be as it keeps everything close to the body so it doesn’t interfere with the ring kit. Unfortunately, I don’t have the correct size bolts to do the same, so I just have just screwed a couple eye hooks into the sled next to the router base and used a piece of elastic string from a disposable dust mask. You don’t need a lot of tension and you don’t have to get fancy, but keep in mind that the force of a “spring” is proportional to the amount it is stretched so you need to find a balance such that there’s not too much tension when the router is raised and not enough when it’s lowered. If the tension is too high, the router may pop out of the control arm and slam into the workpiece. This happened to me once but I was watching… had I not, there would have likely been a fire. If the tension is too low, then you haven’t mitigated the slop. I ended up tieing knots in my string (thereby shortening it) until I found the happy medium.