645 Film Back MFB-1 without Film Insert

this is a tutorial on loading 120 film onto the Mamiya 645 autofocus or contact 645 medium format cameras open the film back with the Mamiya depress these two side button simultaneously with the contacts lift and twist the tab on the side of your film back use the center buttons to remove your insert I've already unloaded my last roll of film so now I have an empty spool at the top open the latch to remove the spool and insert it into the lower part of your insert this becomes your take-up reel the inserts for both cameras will accommodate 120 or 220 film to do this lift the pressure plate on the back and rotate it 180 degrees the Mamiya insert will be labeled on the back the contacts will have little arrows on the side today we're loading 120 film so I'm rotating the pressure plate to the 120 position open the top latch and insert your olla film lining it up with the gear there's also