The arm can be pivoted down out of the way when not in use.
Installation Remove the strings, stop-tailpiece, and tailpiece mounting posts.
One of these sizes should fit your guitar. Thread the correct posts into the guitar, with one flat washer on each post. Slide the Les Trem onto the posts, with the washers between the top of the guitar and the base of the Les Trem, and check for adequate clearance over the guitar. For more clearance, remove the unit and place two washers on each stud. This sets the height of the tremolo arm for your specific gauge of strings.