How Can I Fix a Leaky Gasket on an Old Silex Vacuum Coffee Pot?
All this depends on the integrity of the rubber gasket between the two globes. (See second photo.) If it leaks--no vacuum; and the coffee stays up in the top globe until gravity pulls it down, resulting in overbrewed coffee. (A big leak will keep the water from even rising in the first place. A little one just slows or prevents the "drawdown".)
My pot has developed a little leak. At first, I thought the gasket had hardened or cracked, since it's at least fifty years old; but that turned out not to be the case. I inspected it, and found a little bump right under the flange of the gasket, where it sits on the glass rim of the bottom pot. I gently sanded this irregularity, thinking I could smooth it out, but it turned out to be a bubble, which popped, leaving a dimple about the size of a caraway seed.
I've tried teflon tape, filling the dimple with a tiny dab of Devcon rubber adhesive, putting a bead of the rubber adhesive around the gasket, and a couple of other things, but I only make the leak worse. (Fortunately, everything I've tried has been reversible.)
Anybody got any ideas for repairing that gasket, short of sealing it onto the pot with silicone caulk, which I'm not willing to do?
Thanks for any help!
Long Island City, NY
Photos by edgarandron on Flickr.