Cut with the Park tool or ****s, then whiz the end off square on a bench disk sander or 1" bench belt sander with a fine grit. Do it quickly enough and the plastic housing or liner does not melt.
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My C&V Bikes:
1972 Bottecchia Professional, 1972 Legnano Olympiade Record,
1982 Colnago Super, 1987 Bottecchia Team C-Record,
1988 Pinarello Montello, 1990 Masi Nuova Strada Super Record,
1995 Bianchi Campione d'Italia, 1995 DeBernardi Thron