Onlycafe, interesting suggestion... must try that sometime, if I can get marbles to fit down neck of bottle...
Have tried vacuum pumps, seal usually not good enough.
Best preservation method I've found so far is - brace yourself - freeze the leftovers.
Allowed to thaw, there is no degradation in taste that I've been able to detect.
Disclaimer: oxalic acid crystals will precipitate out once thawed... you may want to decant before drinking, or pour carefully once you approach the lees...
