I finally took delivery of the Head Unit Removal Keys that I ordered from the web a few weeks back. One side seems to unlock OK but the other doesn't. The key just slips back out of the slot with no result. I have tried wriggling it back and forth, tilting up and down, but nothing seems to work. I am loathe to keep trying this in case something gets damaged. Anyone have any sugestions? I am trying to hand mount my Denison ice->Link... Help!