For a winding key, the first place I'd look would be a clock repair
shop.  Ask at one in your area as most clock repairmen stock replacement
keys in many sizes.  If you don't know of one, please write to me
directly and I'll see if I can help: cuckoobob@yahoo.com.geentroep
or rrloesch@jps.net.geentroep [delete ".geentroep" to reply].

Bob Loesch
Northern California, USA
retired clock repairman