How are these applied? They say they can be applied by hand but how exactly?
There is a direct replacement for the metal screw caps, in plastic and reusable. Has been around for 2 years, and has different cap liners to allow for different mico-ox rates. Initial application allows for witness marks. Product is called Novatwist, and is sold by Scott labs in Canada and in California. I have used about 1000 of them over the last 2 years and am happy with their product.
They do not challenge the breaking strength of the thinner screw necks.
Ric