Whats this for?

I bought a Mark Levinson 326S here and was looking over the owners manual box contents and I read "1/8-inch hex key". What the heck would an allen key come with a preamp for? While I don’t have the preamp in possession right now to look at screws. Would Madrigal/Harmon want you to remove the bottom of the unit for some reason, what reason? Or is it the feet that you can change?