ha ha!! Someone else got this problem too at last! The Borg warner No- drum-pully-offy syndrome! Right then -here's what I did - get an angle grinder and chop out the bit of floor that's getting in the way. Get some steel sheet and fabricate a new shaped bit of floor and weld it in place.
Simple!........oh alright, I'll take some photos of it tomorrow if you like. :roll: