How about this? I know here that the national car club I belong to (the ANWB) offers a "car safe", an armoured box that bolts onto the chassis under the driver's seat. I measured it up and found that the empeg *just* fits. The only reason I have not bought one is the thought that if the CAR is stolen, then the empeg goes with it.

If you are interested, I can enquire for you and sort out a price - this would let you leave your player safely in the car, out of sight.
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One of the few remaining Mk1 owners... #00015