Originally Posted by cfonnes
A wing type capper will not work on screw top bottles.
You need a bench capper.
I used a wing type capper to help a friend bottle his batch. It technically still WORKS, but I wouldn't recommend it.
If you compare both types of bottles, you'll notice that the lip on a pry-off is right at the top and is pretty much the thickest part of the bottle, whereas on a screw-top, a narrow lip sits just below the cap, and the threaded glass above it is actually extremely thin.
So the problem we ran into was that about 6 bottles out of 50 or so just ended up breaking at the top as we tried to cap. And the possibility of broken glass (and to a lesser extent, increased oxidation) meant we didn't just dump it into another bottle or anything - so we had to deal with broken glass AND we lost a six-pack of precious beer!