After hearing about an engine coming loose from an engine stand a couple of weeks ago and sending the person to the hospital for stitch's got me thinking ( this is the 2nd person i know of that has been hurt from an engine coming loose) . With the newer bigger engines we are now running ,maybe our test stands need to have a safty cable added like they use on combat engines.wouldnt take long and sure would up the safty factor . i had an engine come loose when i was a teen ager ,i had just stepped out of the way, .it bounced off 3 walls before it came to a stop.