Use a dentist pick. Pick away, I don't care how long it takes you, your chances are still less than 50% this will work. Don't and I say again DON'T try and see if the cylinder is loose, let the cylinder tell you it is loose. Keep in mind this cylinder has been under pressure for over 70 years, and it just waiting to expand.
I remember doing this on my St. Louis pump, I still remember the sound of the cracking.

Jack Sim


Author, 1st & 2nd editions of Gas Pump ID book, 3rd edition is now available at www.gaspumpbible.com
Air Meter ID book also available