It will become second nature eventually. I suggest you grab a dud/ruined roll of 120 and use this as loading/unloading practice roll, using a piece of masking tape to secure the leader of the 'tester roll' to facilitate the exercise. Then all you need to master is aligning the spool hole with the chamber nib on both sides (beware this can be a bloody infuriating exercise in low or poor light!). Practice makes perfect... ;-)

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