Entertainer Darren Day has told a court that it had never crossed his mind that his keyring was an offensive weapon.
The actor told Edinburgh Sheriff Court he was "famous" for losing his keys and the Kubotan keyring, a present from a friend, had stopped the problem.
His appearance follows his arrest in December 2009 when his Mercedes hit a lamppost in Manor Place, Edinburgh.
Day has admitted drink-driving that night and awaits sentencing. He denies the offensive weapon charge.
The 41-year-old said he had carried the Kubotan, a 5in-long metal stick, for the past 14 years.
He has been giving evidence on the second day of his trial.
Day, of Cudworth, South Yorkshire, is accused of having a Kubotan in a public place in Edinburgh "without lawful authority or reasonable excuse".
He was in the city starring in the hit Queen musical We Will Rock You when he was arrested.
He said: "I was famous for losing my keys but I have never lost them since I had this key ring.
"I was thinking a Kubotan was a long cosh and this was a miniature version of that, in the same way a boxer would have a mini boxing glove as his key ring."
He added that he had never been trained in using a Kubotan. "It was just my big keyring," he said.
‘Niave of me’
Asked if he ever thought he was carrying something which might be an offensive weapon, he replied: "Absolutely not."
"It honestly never crossed my mind that I was carrying anything other than a keyring."
He added: "I understand that perhaps retrospectively that was naive of me."
Day then spoke of his surprise after being questioned about the item by police.
He told the court: "I think I said ‘That’s not an offensive weapon’ because I was surprised.
"I was told by the police officer that it was an offensive weapon.
"My reply that it was not an offensive weapon was because I was surprised by what I was being told."
The trial continues.
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