On Monday, September 12, 2016, Erik Levin via OldTools <
oldtools@s...> wrote:

>To free it, I am working on the assumption that the chuck is the push
collar type, not the threaded collar type. Is this correct? 

Yes, it is correct. Three jaw chucks are available, long after market. 
You might want to check out: 
http://www.oldtoolsnstuff.com/yankee%20style%20push%20drills%20info%20page.htm


Mike in Woodland