My supply of envelops for storing 120 film is finally exhauseted. At a photo exposition several years ago I obtained a free package of Savage Film-lok pages for 120 film. Instructions provided on package are too concise for me to understand. My attempt to insert a film strip only results in tearing up the page. If anyone has experience with these pages, could you please pass on any tips on how to use these pages. Somehow I'm missing whatever the label says will "make film handling fasy and easy".