Get a set of internal/external Snap Ring Pliers. Use it to spread the sight hood and position on the base. Wear safety glasses!
Wear safety glasses!
I have a small scar under my lower lip that's exactly the shape of the bottom corner of the hood I installed on one of my R/Cs... Spring steel? Check. I used needle-nose pliers and pulled the handles open.
This works to remove or install the hood. This is also how it was done in the field when needed to adjust the front sight over. Soldiers didn't carry pliers, but they carried string.
First off: What year is your rifle? The ones made from 1943 onward were fitted with sight hoods. The earlier ones did not have such features.
I always wondered how they did it in the field.



























