Use a soft copper flat washer between the wing nut/bolt and the lid. It will seal much better than an O ring. Don't be afraid to tighten it firmly- - - -those things are hard to seal.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!