Removing sprocket after someone has threadlocked it

[HTML][/HTML]So basically a mate gives me a wheel with fixed/free hub. Altho he has suicide fixed one side and fixed and lokring the udder. Want to put freewheel on one side. Both sprockets are threadlocked on. Firstly, can you put freewheel on fixed side of hub? Just in case that's the only cog i can get off!! Secondly how the bloody hell do u remove threadlocked cogs?!?! I have tried skidding it off (both sides individually) going WELL fast but they dont shift. Is a block of wood and a vice any more likely to work? I'd say the torque from me skidding is more than the old vice trick? Experience? Or any better ideas?! Thank you

yes you can put a free wheel on fixed sprocket threading.
Try pouring boiling water over the threads, or taking a blow torch to it. The heat will weaken the thread lock.

Would rotafixing it work?

Vice, freewheel tool and long piece of pipe over the wrench handle to give you a shed load of leverage??

Would rotafixing it work?

This

Never had any joy with rotafixing or reverse rotafixing before today but tried it again and it is like magic. Worked a treat. I thought if i couldnt skid it off we didnt have a chance with rotafix. I was very very wrong. Thanks everyone!

Heat before trying the big lever.

^^ ditto, but better off with gentle heat from a decoraters heat gun on the sprocket avoiding boiling the grease in the hub if poss :D