1907 and other Press Stud Tool

To the guys on this forum who used to repair these British bayonets is there a tool available to safely undo the Press Stud Button with the two slots to replace a broken spring?
I do not want to use anything that will leave a mark

The same applies to the screws in the handle!

The one in the handle can be easily made and resembles the originals. The press stud is easily gripped by protected vice jaws and leaves no marks. You will however have a flash of steel from the screw that was riveted down to deal with.