Here is a link to a short video on Youtube which demonstrates fairly well the procedure for disassembling a Braun 6520 model:
http://www.youtube.com/watch?v=K7U-A4MC2A8
The procedure outlined in the video will be similar to the one required for disassembling your model 7526 shaver. Here is a link to the user's manual for that model in case you do not have it already:
http://www.service.braun.com/line/SH/S5493/S5493_14_NA.pdf
To view the Youtube video or the Owner's Manual with Operating Instructions just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the information at the website indicated and the contents of the Owner's Manual.
You may need ADOBE READER installed on your computer to read PDF documents.
You can download this free at
WWW.ADOBE.COM if necessary.
Click on the DOWNLOAD ADOBE READER button on right side of the ADOBE home page when you get there, then follow the onscreen instructions to install the software on your computer.
Please comment back here to this page if you have any details to add, have any questions, have difficulty accessing the links, or just require further general assistance and I will respond as soon as I see it.
I hope that was helpful to you, good luck and take care.
Joe.