2001 Boxster S Axle boots and some odd findings.

[Gelbster]

Pelican sell the correct clamps for the CV joints.They are Oetiker clamps a.k.a. crimp clamps. In theory you need a special pair of pliers to crimp them tight. I used an old pair of blunt pincers.
Fitting common worm-drive hose clamps is not recommended.
AS Markus hinted, if you don't get all the grease off the lip of the boot and the mating part of the CV joint - you'll be repeating the entire job soon.