A cyclist was caught by police carrying a knuckleduster when they stopped him for riding without lights.
Nigel Christopher Batten, 32, of Harrowby Lane, Grantham, admitted possessing an offensive weapon in a public place on April 1.
Prosecuting, Nick Todd said Batten was stopped in St Catherine’s Road, Grantham, at 1.50am.
When he was spoken to by the police he admitted he was a drug user and they searched him and found the knuckleduster.
Rob Arthur, defending, said the police officers asked Batten to empty his pockets and it was then he handed over the knuckleduster. He said a friend had given it to him and he intended to put it in his house for decorative purposes.
Mr Arthur said: “He fully complied with the police and was no trouble to the officer.”
The court heard that Batten was “on the sick” from his job at Christian Salvesen because he had had an operation to repair a tendon in his left hand but this had not worked and his hand had swollen up.
Magistrates fined Batten £110 and ordered him to pay costs of £85 and a victim surcharge of £20.
They also ordered the forfeiture and destruction of the knuckleduster.