This is truly one of the better party tricks I learnt at Uni - likewise, I have had the same experience. Something that will remain imprinted on my memory long after other memories of that time have faded
I remember doing this with a pin and a single cone, but didn't know the 'cones at 90 degrees' trick... I'd try it, only I'm not prepared to risk my vinyl!!
I have to admit to a feeling of great distress when I see 18 year olds unable to deal with a record deck and a piece of vynyl, yet able to change a cassette tape, a car wheel, or operate a dish washer.
I also have to admit to a feeling of great distress when I see 18 year olds.... but usually because I realise I was sitting O levels when they were being born!!

Geoff
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Got one of the first Mark 2 empegs...