With a film retriever it is simple to get the end out of the roll. I have, in the past, used a small section of 35mm film as a retrieval tool. To try this clip one of the sprocket holes and fold out the outside edge to where it forms a little "L". Then shove this into the spool and try to hook the film inside by a sprocket hole. Turn the center spool to catch the part you push into the spool. It works for me about 1 out of 300 times I try.

Denis K