How do you secure the tray on the XRF?

Does anyone have tips for securing the tray on the XRF? I’m using the PiBurn with magnetic feet, which works great, but I’ve noticed a bit of wiggle on the crumb tray—both side to side and front to back—when swapping out cups.

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A slight wobble is normal. This is because we need to leave a small gap to make it easy to insert and remove the tray. If you need to eliminate the movement completely, you can try using shims to reduce the wobble.