Weird bottling problem

So I started recently using mostly old glass bottles with caps as my primary bottling system. Before I had plastic PET bottles and about 12 liter swing top bottles. Now I still like to use the glass bottles because their nice and I paid a good bit for them. Now half of the glass bottles 2 batches ago and almost all the glass bottles from this batch are almost totally uncarbonated. It's possible that I'm just not doing a good job closing them, but its unlikely. The capped/PET bottles seem to do fine...what am I missing?

How are you capping your bottles?

danielinva said:

How are you capping your bottles?

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Well the ones that work im capping with an Emily capper, the ones that don't work are the swing tops. They used to work fine with only maybe 1 or 2 not fully carbonated.

Sounds like it's time to switch out your rubber gaskets.

Probably the rubber seals. I have a few of the same bottles and periodically need to replace them.

My swing-tops haven't been used enough to replace, but I read in a thread somewhere that after every 5-6 uses, replacement is a good policy. I bought a bag of the gaskets from Midwest, and they're cheap enough.....

I've found some gaskets to compress after a couple uses, I replace them when I use my grolsches.