Brake reservoir screw head issue

[satchit]

Thank you everyone for your ideas and suggestions. I should be getting the replacement screws by the weekend so early next week would be my next attempt.

I don't want to try the impact option or the drill and extract option unless they are final resorts. If it ever gets to this point, with [url=http://cb1100forum.com/forum/showthread.php?tid=8360&pid=270458#pid270458]my luck, I'm guessing I'll be forced to replace the reservoir.

1 Would try to remove the one good screw and see if you can rotate the lid so as to break the head loose.
2 sharpen a flat head screw driver so it has the widest grip on the bad screw and very sharp biting edges.
3 try tightening and un-tightening alternatively and use some wd40 or equivalent.

Thanks for the picture, that really helps.
Also put the new screws in with some grease in the threads, let us know how you get on.

I hope that option 1 above works out - the other screw comes out easily. Does anyone know if the lid has a lip or whether the mating surfaces are flat? I'm wondering how much I should try and rotate the lid. Looking at the part diagram I'm guessing the diaphragms would limit the amount I could rotate the lid.