I can recommend this service:

http://www.service-uhrwerk-5100.com/our-goods-services/

Prices are really ok, and the watchmaker is a specialist for Lemania 5100 chronos. Anyway, it is in Germany.

Best wishes for you watch,

rega

: Ola' Bernardo.
: The Lemania 5100 can be a tough one for some watchmakers, I've
: heard horror stories and also experienced one myself before
: finding safe havens here.
: So make your due diligence: if you choose to go via a local
: watchmaker, do make sure to ask them if they've serviced it
: beforehand. And that they have access to parts, which are
: getting scarcer and scarcer.
: Otherwise some names here can surely help, though they're mainly
: located in Europe or NA - all of them excellent.
: Another option is TAG Heuer themselves, but be aware they'll most
: likely strip your watch of the vintage parts and substitute them
: with service ones - and that it'll be surely costly as most
: likely they're going to ship it back to Switzerland.
: Hope this helps.
: Tchau,
: Fabrizio