Removing a freewheel or sprocket from a hub or cranks can be an incredibly awkward job. Adam of www.tartybikes.co.uk explains a couple of very effective methods that might make your life easier!
Tools needed:
Freewheel tool
Old chain
Big adjustable spanner
Threaded bar
Some form of extension for leverage (scaffolding works well!)
A very sturdy vice
Good luck!
www.letsfixit.co.uk/wp-content/uploads/2013/03/FreewheelRemoval_x264.mp4