Tried wd40, tapped with hammer, upside down in vice. Seems all that is left is to cut off and file away till next Xmas! 2 things....is there anything else I can do before last resort of file. 2nd, any tips n hints on file process.....how low should I cut off post. Steel frame, probably steel(?) post, late80's, early 90's Sparta. Ding dong merrily on high and all that to you all.