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Join Date: May 2008
Location: Fredericksburg, Va
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Bikes: '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, '94 Burley Duet, 97 Specialized RockHopper, 2010 Langster, Tern Link D8
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My standard way to pry open is to use a large flat screw driver from the inside to outside to ensure to engage the seat binder boss. Go gently. It may not even require a hammer, tap with the palm of you hand. A mandrel would be ideal but I don't have one. My expereince is that once it is spread, the clamping of the post will round it out enough. The material is pretty soft so go easy, after all, it has to be flexible to form and hold the post.
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