[BDM]

First, remove the two screws holding the shadow meter bracket
[Image: http://antiqueradios.com/gallery/d/78669-1/1000.JPG]

Then, remove the dial scale mount. It has an inset screw on the backside
[Image: http://antiqueradios.com/gallery/d/78671-1/1001.JPG]

Then, remove the screw behind the dial scale mount
[Image: http://antiqueradios.com/gallery/d/78673-1/1002.JPG]

Last, remove the two upper dial turnstile bracket screws
[Image: http://antiqueradios.com/gallery/d/78675-1/1003.JPG]

Ed(etech) has also done this. When I removed mine last year. I didn't take it apart. I just soaked it, blew it clean and re-oiled it. Works perfect to date. If I remember correctly, the dual speed dial assembly has a clip on the rear retaining the clutch pressure spring(for lack of a better word). Ed may be able to comment further. Proper adjustment is needed when re-installing it. Or it will bind, or have a gravel feel to it. Now, your chassis looks exceptionally clean. Maybe you can just leave it as is, blow it clean and apply a dab of oil. That's what I did with my 650B. It's as clean as yours.