Have you tried contacting the manufacturer? They may be able to repair them at little cost to you. Since you are both in Germany shipping shouldn't be
all that bad.
What is the base made out of? If it's aluminum and you are mechanically challenged I would recommend that you leave it alone. An M3 bolt is fairly small and would probably be rather difficult for a neophyte to remove without damaging the base. A good machine shop should be able too repair it at a reasonable cost. I would recommend checking into this first you just might find this is cheaper than shipping it to dhs. Another piece of advice is that if you do give it to a local shop take it apart before you give it to them. Only give them the piece that needs repair, you don't want too chance the electronics or some other part is damaged.