May I give credit where it is due. I didnt really consider this until I saw ToolJunkies reference to Walters cut off discs. I watched a commercial for them and was convinced I should try your method. I didnt know these could cut through I-beams! Never used them except that one time on the die grinder and broke about 3 rules using them......25K die grinder with a 13K wheel? yeah, DUH! Glad it fragged away from me as I was perpendicular to the rotation.