Sarah Bluck (50), lost part of her middle finger after a stun grenade she purchased exploded in her hand.
Bluck bought the stun grenade from Paul Heddell's wartime paraphernalia stand, at Folkestone Racecourse. She had bought the grenade thinking it had been deactivated.
Earlier this year, Paul Heddell had been jailed for five years for possessing a machine-gun.
Heddell admitted two breaches under the health and safety laws, and was given a six-month jail sentence by Judge James O'Mahony.
