Hi all, HELP needed please, I bought a used Tesoro Eldorado u max (plastic box) from staffs metal detectors uk but not knowing to me it has the E180 discrim circuit in the box which is no use whatsoever in my neck of the woods this side of the pond due to the amount of iron on my sites, I understand the ED-120 would and does suit better for the uk and was wondering if it is possible to change to the ED-120 on my Eldorado or would I have to get rid and buy another with the ED-120 circuit? is it possible to modify the elderado discrim down to ED-120? plus what Tesoro,s run with ED-120 discrim. thanks in advance Andy. ps photos attached