I was giving my 987 a thorough clean the other day and removed the plastic cover which exposes the battery etc. I noticed a black disc about 40mm diameter and about 10mm thick, with 2 wires coming out of it, dangling beneath the plastic bit where the wipers are. It has a pad on one side which looks as though it may have been stuck somewhere but the adhesive no longer works. The device has no markings on it and I can't see where it might have been stuck. I can't believe that it is supposed to intentionally float about in the compartment. Any ideas what it is and where it's supposed to fit?
Cheers