I tend to pull down on the thumbstick after playing a while, and limit my ability to turn fully. Is there any sort of adapter that would limit the thumbstick to only move left/right along the x axis?
This is what I use for racing games, the Speed Freek Apex by Kontrol Freek:
While it doesn’t limit Y-Axis movement via a physical barrier you may find yourself turning “straighter” with this. Normally, I’m brushing the “wings” of the add-on to steer, lightly pulling to turn left and pushing to turn right. It’s handy for slight adjustments in particular, allowing you to use a higher sensitivity setting.