Can anyone with 140mm rotors and flat mount calipers help?

I'm about to install a Shimano BR-RS805 caliper to my frame as part of a build and was wondering if someone who has 140mm rotors and flat mount calipers could help?
Page 50 of the Shimano instruction manual (http://si.shimano.com/pdfs/dm/DM-BR0008-08-ENG.pdf) indicates that when using 140mm rotors with flat mount calipers that the bolt that secures the caliper to the chainstay should not require a washer.
The washer only appears to be required if using 160mm rotors (page 51).
Page 44 details the length of the bolt required based on the frame thickness. The bike manufacturer has confirmed to me the length of bolt required so I'm assuming I've got the correct one (see photo below).

If the washer that is supplied with the bolt is not required does anyone have any idea how to remove it from the bolt? The threads seem to stop the washer moving along the bolt.
Page 50 of the Shimano instruction manual (http://si.shimano.com/pdfs/dm/DM-BR0008-08-ENG.pdf) indicates that when using 140mm rotors with flat mount calipers that the bolt that secures the caliper to the chainstay should not require a washer.
The washer only appears to be required if using 160mm rotors (page 51).
Page 44 details the length of the bolt required based on the frame thickness. The bike manufacturer has confirmed to me the length of bolt required so I'm assuming I've got the correct one (see photo below).

If the washer that is supplied with the bolt is not required does anyone have any idea how to remove it from the bolt? The threads seem to stop the washer moving along the bolt.
"One thing that is worse than Carlton Kirby: people complaining about Carlton Kirby.
Talk about first world problems."
The_Boy, 13/4/14, Paris-Roubaix 2014 "spoiler" thread
Talk about first world problems."
The_Boy, 13/4/14, Paris-Roubaix 2014 "spoiler" thread
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Not sure I understand? The bolt is installed from the underside of the chainstay so the washer is always below the chainstay and caliper.
Talk about first world problems."
The_Boy, 13/4/14, Paris-Roubaix 2014 "spoiler" thread
On my flat mount the bolt goes through the caliper and threads into the chainstay/fork.
Ribble Gran Fondo, Campagnolo Centaur (winter bike)
Van Raam 'O' Pair
Land Rover (really nasty weather
That's true on the fork but the instructions definitely show the caliper bolt going through the chainstay first on the rear. What flat mount calipers do you have on the rear?
Talk about first world problems."
The_Boy, 13/4/14, Paris-Roubaix 2014 "spoiler" thread
805's
Ribble Gran Fondo, Campagnolo Centaur (winter bike)
Van Raam 'O' Pair
Land Rover (really nasty weather
Marin Nail Trail
Cotic Solaris
They are captive washers and are not designed to be removed. I think you are confusing them with the thicker spacer type washers, item (B) shown on the illustration at the top of page 51, of installation instructions.
Yes the thicker spacer type washers are the confusing bit. They don't seem to have been supplied with the hydraulic disc brakes and calipers so it is a good job that my rotors are 140mm diameter and I don't need these spacers!
It now looks like the bolt lengths that the frame manufacturer advised I required are incorrect so I'll have to order the next size up.
Talk about first world problems."
The_Boy, 13/4/14, Paris-Roubaix 2014 "spoiler" thread