The mystery Hatton Garden ringleader known as "Basil" has been found guilty for his part in the £14m heist.
Alarm specialist Michael Seed, 58, was convicted of conspiracy to burgle over his role disabling the security system, as well as a charge of conspiracy to hide the proceeds.
He evaded capture for three years before police raided his flat in Islington, north London – around two miles away from the scene of the crime – last March.
In the heist over the Easter bank holiday weekend in April 2015, Seed is believed to have let himself in to the building in London’s diamond district using a set of keys before getting past security at the Hatton Garden Safe Deposit
Seed was one of two men who squeezed through the hole that was drilled in the vault.
They then gained access to safety boxes in the heist, looting 73 of them.
Seed was cleared of a charge of conspiracy to burgle relating to a £1m burglary at the Chatila jewellery store in Bond Street over the late August bank holiday weekend in 2010.
He had denied all the charges.
Seed will be sentenced later today after he was found guilty at Woolwich Crown Court – the tenth person to be convicted over the heist.
Police raided his one-bedroom council flat in Liverpool Road, Islington, on 27 March 2018.
Officers seized more than 1000 items from his home, with most of them stolen in the Hatton Garden raid.
They were valued at more than £143,000.
Seed, an electronics expert who was unemployed, told police he was a jewellery worker when he was arrested.
He claimed the heist gang’s ringleader John Kenny Collins had given him a mass of jewellery to take apart and melt down.
Seed had been seen on a police surveillance camera meeting with Collins.
Police found specialist electronic devices in his flats such as motion detectors, alarm blockers and radio jammers.
Seed claimed he made radio jammers for fun and denied being Basil.
CCTV footage shared during the trial showed that Seed and Basil had the same distinctive walk.
A podiatrist likened it to that of Charlie Chaplin.
The four Hatton Garden heist ringleaders Collins, 78, Brian Reader, 79, Daniel Jones, 61, Carl Wood, 61, and Terry Perkins, who died last year aged 69 – were caught within weeks of the raid and later jailed.
Jones wrote to Sky’s Martin Brunt while he was in prison and told him Basil was still on the run.
He said he didn’t know Basil’s true identity but had heard he was a former police officer.
Most of the Hatton Garden loot, around £10m worth, is still missing.
(c) Sky News 2019: Michael Seed: Hatton Garden burglar ‘Basil’ found guilty over £14m heist