I have the spanner wrench. I've applied enough pressure in each direction. The rear sight took the oil easily and works just fine. The front sight probably hasn't been moved in years. In fact both sights are set on "home" spot. The front sight, I would imagine, would get banged around and roughed up the most and would collect grime, etc. more than the rear one. The front sight does have a nick on the leading edge.
I'll try soaking it in liquid wrench. I'm not sure if I can obtain any Kano Kroil.
Soaking is probably the answer because the solution must get into the workings to take effect. However, it's sort of blocked by the very construction of the unit.
I need a toggle and a side plate for Arty # 2510.
Thanks
Jack
