habadir, a belt sander with a table is the quickest way. set the table at 90° to get it square in the up and down direction, then clamp a 90° angle block (or angle iron will work) to the table to keep it square in the left and right direction...and grind away. keep a bucket of water close by so you can dunk the spring every 10 seconds or so.....good luck.
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Last edited by Tim5779; 09-20-2012 at 02:10 PM.