Ross M10 Rear sight problem

Hi there, new to forum and new to Ross's. As a collector of Enfields, I was always intrigued by the Ross, finally bought one a week ago, appears in very good condition and shoots well - 4" groupings at 200 yds using the battle sight. Definitely room for me to improve. The windage adjustment on the flip up however appears to be seized and no amount of cleaning seems to free it up. The roller will turn about 1 full turn before locking up, but the scale plate(?) doesn't move. I tried lightly tapping it after rolling the tumbler both ways but no luck. I was looking to see how the sight could be disassembled, but haven't found any information on how to do that. Any thoughts or suggestions would be greatly appreciated.
Thanks
Max

To disassemble the Ross rear sight you will have to bend the arm where the thumb screw is. Just bend it JUST enough to slip the thumb wheel out of the collar.
The sliding windage plate is a problem with about 99% of Ross rear sights. Strip the rear sight completely and then carefully polish the sliding plate beveled edge and clean out the matching grove in the sight frame. You might have to touch the grove with a small three cornered file if it has a small divot impeding the indexed plate from moving. IF the very small threads on the ends of the windage thumb screw are damaged you are knackered. This is the reason you will find so many 1910 Ross rear sights with the windage thumb screw removed and just staked in place. I used to have a small bag of the windage thumb screws and will look and see if I still have some but don't hold your breath.
Hope this helps.....
cheers,

Will give it a try, see what happens. Looks like the roller has been stripped a little too, hopefully not to the pont it won't work properly any more.
Thanks for the help
Max

In UK WWII service I believe the leaves were staked (center-punched) in place once zeroed - or more likely just set to zero and punched. There wasn't much time for range tests in 1940.