Thanks again Bob.

Yes, I would be concerned about distortion.  Probably not a good idea.  I,
too heard a similar story.  A friend of mine was the manager of an aircraft
sales company that sold GrummanTigers and such.  He had a guy that did the
deliveries from the factory and once during a delivery noticed the engine was
seeming to run leaner and leaner.  He then looked at the wings and noticed
dimpling between the ribs.  He landed, ran a paper clip or something in his
vent tube, they went "POP!" and he was off again!

And also related, one of the boats I use to race was a very light weight
dinghy called a 505 (it was 5.05 meters long).  One of our competitors kept
having leaks in his hull-deck joint so he figured that if he glued a vacuum
hose to a screw in deck port and put the hose on the exhaust end, he could
check for leaks with soap bubbles.  However not being an engineer, he didn't
stop to think how many square inches he had there even with a loe PSI system
like a shop vac.

He did find the leak, however.  It was his whole deck when he blew the deck
apart!

Dan