If you need to take your E61 group apart to lubricate it or replace a part, here is an excellent exploded view of all of its parts, how it comes apart and how it goes back together. If you have water leaking from the lever of your E61, chances are you need to replace the two rubber washers identified in the exploded view as item number 602576. If there are other small parts you need, you can email our service department at firstname.lastname@example.org with the part number and quantity you want to order. They will email you back and advise you if we have the parts you are looking for with a price and how to order them. There are many parts we stock that may not be on our web site.
For further information about an E61 group brew head, its internal parts, and mode of operation, there is a video. Instructed by Bill Crossland, he goes into great detail, step by step, how water enters the brew head and into your coffee. He has uniquely sliced open the brew head and other components so you can easily see the mechanics in making espresso.