You should be able to just insert the gearless and of the key into the chuck and smack it with a hammer. Always worked for me.
use the key hole, not the jaws.
Is the V8 Tools Inc VT8109 9 Piece Metric Super Thin Wrench Set any good?
http://www.amazon.com/dp/B007QV1EPG/?tag=atomicindus08-20
Park may not make a 19mm, if you find a 3/4" that would work as well though. That range is about out of bicycle tool size, the largest I have is 18mm. My Facom set goes to 19mm.