For all you folks whose 'antique' aircraft clock needs to be repaired or even a simple cleaning and oiling to keep it 'clocking' without thumping or a/c vibration, I have had good service from:
Jeff Bartelt, master watch maker
Miller Clock Service
1820 South Koeller St
Oshkosh, WI 54902
920-235-4750
www.millerclockservices.com
My Wakmann repair (broken main spring) cost only $85 two year ago; not sure what the current price is, but will be finding out shortly as I have another clock to clean. Jeff also does other types of time pieces.