From Randy Jessee's submission to the Alumni section of the Official WUVT Web Site:

...And there was the troubleshooting guide, prepared by Chief Engineer Charlie Tyack, that concluded with "10. If all else fails, apply 10-D tool to machine." Rookies (myself included) thought the 10-D tool was some fancy engineers-only item; it was any large foot, strongly applied. And it usually worked."

Read Randy's complete submission here.