Two men stole drills from Spalding’s B&Q store, took them into the store’s garden centre and lobbed them over the wall into Sir Halley Stewart Field.
Marian Laczynski (34), of Carrington Road, Spalding, and a co-defendant went into the store separately, each took a drill and walked over to the garden centre.
Marie Stace, prosecuting, told Spalding magistrates the men were followed by a manager, who heard the drills hit the ground on the far side of the wall.
Laczynski admitted being jointly concerned in the theft of drills worth £225.86 on November 11 when he appeared in court on Thursday.
He was fined £75 and ordered to pay £85 costs and a £15 victim surcharge.
The second man was dealt with by a court in Lincoln and ordered to do 70 hours unpaid work as part of a four-month long community order.
The court heard he had far more previous convictions than Laczynski, who had one conviction two years ago.
Solicitor Daven Naghen, mitigating, said it was the second man who threw both drills over the wall but Laczynski accepted it was a joint venture.
Mr Naghen told the court: “He accepts he has probably blindly followed his friend like a sheep.”
The men didn’t go to the other side of the wall to pic up the drills, presumably because they realised they had been “rumbled”.
He said Laczynski is out of work.
“Clearly, by coming before a court, he has not enhanced his prospects of work,” Mr Naghen said.