HS kids can be remarkably obtuse. Self-ejecting keys seemed worth the
expense.

When you consider the issue of span of control in an environment full of
dangers, rigid rules enforced by peers also seem a good idea.

"Barry N. Turner" wrote in message
.. .
John sounds like a woodshop instructor I had in college. He drilled into
us
to never ever ever leave a chuck key in a drill press chuck or lathe chuck
or to leave a wrench on a shaper spindle. You should hear some of his
stories!

He always insisted that we never relax our grip on a chuck key until it
was
lying safely on the bench again.............no matter what. No excuses.
No
exceptions. Period.