Macman,
There is a loading and impedance matching coil in the base
of the antenna just below the spring. It may be possible to
find a length of 'whip' that in combination with the loading/
matching coil will allow operation on 2 meters. Then again,
it may not be possible (don't bet on it).
Another option would be to remove the covering of the base
coil and re-tap it. One problem with that is that the covering
will probably be destroyed in the process. Another problem is
that the supplied coil probably doesn't have the correct
dimensions
required (you can always re-wind and tap it).
It won't be as simple as just 'trimming' the whip...
'Doc