Hi Ben,
Go to The Hammarlund Historian website:
http://www.hammarlund.info
and to the "service" secn, then to "Parts or service sources"
The last I knew, the Hummels still had clocks.
You might find some other usefull info on the site also. There's a
downloadable manual for the HQ-170A, sorry, no plain 170 at this time, but
not too many differences.
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.boatanchors.org
http://www.hammarlund.info