I'm sure you know this but just in case I'll say it anyway. The only purpose of the compression plug is to preload the headset bearings until you've tightened the bolts on the stem. It's secondary purpose is to give the steerer tube a bit of support at the clamping point of the stem. If you're tightening the bejeesus out of it to hold the fork in place that's not what it's for.
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Greg
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