>I purchased my audio cassettes from ORWO - there was not much choice those days.

They weren't too bad. Actually they were physically more resilient than some others, so I kept most of my Spectrum software on them.

From the same age:

"Don't buy cassettes by japanese band TDK - you can't hear a thing!"

>http://stat.heiseshop.de/media/catalog/product/cache/1/image/469x582/9df78eab33525d08d6e5fb8d27136e95/a/g/agetest.jpg

But it's wrong... you need a ballpoint pen, so the clip would get into a sprocket and you wouldn't have to rely on friction alone. Actually a proper screwdriver was even better.