G'day,
Try locking the blade against the base with a pair of vice grips then get the solid bar socket thing (not the ratchet the other one) place it on the nut and hold it in position. Then tap the end (or belt it if it�s that stuck) until is comes loose. Just make sure it�s centered and square so it doesn�t strip the nut. If its still stuck whip out the blow torch and repeat what�s up there but first pre heat it and you should be fine.
This works along side Bruce�s suggestion. The sharp blows unlock the bolt. This method has never failed me with any bolt yet.
Regards Jay
