I have used Howard (Policeluger)'s method (judicious stippling at the dovetail base surface with a prick punch, with much success over the years to tighten a loosened front sight blade in a dovetail.
I had not thought of Ron's method, but I am sure it would be helpful... as would the appropriate type of locktite...
My rule is never file a sight dovetail unless it is a brand new one that you are creating... 
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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