Cleaning/reaming it wont make it any tighter.
I think the idea works like this.
He has a 27.0mm post that is loose. (let's suppose the seat tube is 27.1mm)
He get's it reamed to 27.2mm.
He then inserts a 27.2mm post.
@tynan started
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I think the idea works like this.
He has a 27.0mm post that is loose. (let's suppose the seat tube is 27.1mm)
He get's it reamed to 27.2mm.
He then inserts a 27.2mm post.