Thanks guys. I finally managed to budge it. It was a very stressful moment.
One other problem I had with mine and wanted to know if this is common - Bonecrushers foot came right offWhere it splits in two, there's a shiny pin holding it in place and the pin basically popped out. I pushed it back in but there was no 'click' or some other such noise to indicate it went back in properly. So, what's holding this pin in place? I suspect that kup may be able to answer this best.