These are some pics I took of the blade on our 8640. Should be very similar on your 8650.

 

(2012-04-12_18-13-54_129.jpg)

(2012-04-12_18-14-08_299.jpg)

(2012-04-12_18-14-18_739.jpg)

(2012-04-12_18-14-44_20.jpg)

(2012-04-12_18-15-38_775.jpg)

(2012-04-12_18-16-03_465.jpg)

(2012-04-12_18-16-15_425.jpg)

(2012-04-12_18-16-45_678.jpg)

2012-04-12_18-13-54_129.jpg (26KB - 20 downloads)

2012-04-12_18-14-08_299.jpg (24KB - 19 downloads)

2012-04-12_18-14-18_739.jpg (20KB - 23 downloads)

2012-04-12_18-14-44_20.jpg (25KB - 21 downloads)

2012-04-12_18-15-38_775.jpg (13KB - 17 downloads)

2012-04-12_18-16-03_465.jpg (18KB - 21 downloads)

2012-04-12_18-16-15_425.jpg (25KB - 24 downloads)

2012-04-12_18-16-45_678.jpg (21KB - 27 downloads)