It's been a while since I've had the original stereo in the TT, but I don't remember thinking that it touched the knobs - the only one it may have touched was the volume/on/off twiddly thing.

Perhaps it was designed like that to turn off the stereo when the top was shut - but I don't think so.

Paul.

Paul Haigh, 6GB, Blue
Reg: 4120 - Serial 00254
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Paul Haigh, Reg. 4120 (mk1) 6GB, Blue, 00254 (mk2) 12GB, Red, 00357