Media dispenser for 96-well filter plates

Device to add media to 96-well filtration plates. Fit standard filtration plates (where top of plate is approximately 125 x 83 mm); wells add about 150 uL in volume of media. We use this to add silica to filtration plates in screening chemistry experiments; little tap and it all falls in.

Assembled with cyanoacrylate glue; holes in knob and drop plate are about 2.5 mm and were manually threaded with a 4-40 screw; screw was cut to appropriate size and a piece of compression spring was added