Quote:
Originally Posted by TonyDuell
There are grooves (quite shallow) on the inside of the hole in the reel, there is a spring-loaded ball on the side of the hub that locates in one of them. I am not sure if said grooves are essential though.
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The machines I've seen (which admittedly are not many, and most are of the Swedish Luxor brand) use reels with a smooth surface inside the hole, and the matching spool carrier in the recorder is also smooth, with a spring loaded ball. Apparently the friction is enough to keep them in place.