I bought a OLD capper off eBay. In trial runs at capping, the bottle becomes very stuck. A good 2-3 minutes of twisting seems to free the bottle, though I'm pretty sure it is not sealed. After moaning, fussing, and forum searching, I found that the capper ought(?) to have a rubber gasket as seen here.
Does anyone know if gasket replacements are available? If not, anyone got a DIY solution?