hi lads ive gt a mk1 locator its a 15ft box and use it with a 8ft collar [bANNED TEXT] the box gets between 6 and 7ft the box starts buzzing does anyone no what causing this and if its a expensive job to fix and also if anyone noes someone who fixes them still.also when the box is buzzing (arrow on the box pointing down to the floor) and then i turn the box on its side the buzzing stops but doesnt pick up the collar. chhers