On Dec 18, 9:44*am, Ned Simmons wrote:
On Thu, 17 Dec 2009 23:18:45 -0500, Joseph Gwinn

wrote:

The 5/8" square is the same as in used on the drawbar and on the knee
Z-axis (up and down) crank, so one can use the one crank handle to
perform all these functions.

Or you can replace the hex keys with a couple of the adjustable
handles on McMaster pp. 2181 thru 2184.

--
Ned Simmons

Or, you can make up your own screw with a captive wrench.

Make the screw from a piece of 3/4" or larger round rod. Mill the
square or hex, but leave some of the round at the very end. Leave the
screw shank long enough to allow the wrench to turn on it.

Similar to the nuts often used to keep wrenches captive on lathe
tailstocks.

John Martin