You could solder a small pin or even just leave a solder boll just below the screw on the inside of the clip. Then create a small dimple that would accept the pin/solder ball. When screwed in, it should prevent the clip from rotating under normal use.Any suggestions on how one can screw the clip into the cap with a single screw and avoid rotation of the clip?
I am attaching here a few pics
Put the nut on and tighten it inside the cap and then press your finial in.Thanks
the pen is sterling silver.
The D screw might work, but how could I tighten it from the inside of the cap?
the dimple idea is also very good