Expert: William J Perkins - 8/14/2008

Question
Franz Hermle mental clock, # 340-020, my mother-in-law lost the key, where could i find one
thanks, gilles

Answer
Go to a local jeweler and ask him to get you a size #7 clock winding key.  That should fulfill your needs.  You might luck out by visiting local salvage outlet, examine the keys they have on hand, and maybe, just maybe you'll find a size #7 in that group.
Regards WJP