The source selector on my Rega Elex integrated amp got completely loose, so I used the occasion to get a new integrated for my bedroom system, as I wasn't quite satisfied with the sound of the old unit anyway. Now, I would like to open up the thing to have a look inside, but how do you do it? It seems that the rifled upper half of the chassis should be separated from the nether half, but I don't have a clue as to how to manage that.