Nikon F4 Waist Level Finder - DW20 Dwell Sight

I don't have an f4 camera so it's being sold as completely untested People online report it fits fine though (see last pictures) but I cannot assure it might not need further fine work (sanding, adjusting etc) They show signs of glue and sanding It should snap fit in the viewfinder slot Price is for one, the 3 pictured are ready to go. The tall one in white on the left should include the front display