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Some will wince at this but if you very carefully relieve the sharp edges and corners of the drive tang, it may help . Obviously do this with a file,carefully, by hand not a die grinder and take precautions to collect the filings(grease). Clean meticulously and start pushing rotating slightly left/right to coax it back on.If it goes in slanted , start over and don't use the bolts to pull it in.You'll strip threads.
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