Toyo Quick Roll slider 4x5- Where must sit the two blades?

Remove Fresnel/Groundglass-combo from Toyo Quick Roll Slider 4x5 for temporary use in Bessa I. image is very sharp. Ontop is a metallic frame -see image.

Inside are two blades on left and right sides. Must they positioned inbetween Fresnel and Groundglass or ontop of Groundglass right below this frame?

I dont remember anymore when i compared focus at filmlevel of filmholder with Groundglass here in a 4x5 camera.

my version is Graflok 23/RB 67(Toyo No. 1045. folding hood 1039 is missing. if someone has. there is also a focusing hood with 1.5x No 1040.

if you need to know about the other Slider versions. i have a prospectus in german.