Ok... there's a strange occurrence I have noticed while trying to sell items...

I tapped my top equipment button, put the 'broken goggles' in there... they I tapped my lower equipment button and put the 'black pearl' in. I got the "You cannot put the same item in both slots" message (which I believe, Dusty, was related to the solution for the strange switching horse bug previously, might be wrong). My broken goggles remained in the first slot, and when I tried to sell, Mr Elster asked me if I wanted to sell '6 black pearls.' I had six black pearls in inventory, so this is not really exploitable to switch with, say, an item worth more ( I tried dagger of famines, purely for experimentation's sake, I assure you), and upon actually selling the item, the broken goggles remained in the slot until I tried to 'use' the item again, at which point it was replaced by good old bow and arrow.

Hope that helps.