In a chat about cutting bottle neck slides, I remembered I had this old gadget, a yard sale find, which may or may not be an antique glass cutter for cutting gauge tubes for steam things. So I had to find it... and then I had to try it out.
I rinsed out a hot sauce bottle for the test. Yes, it will scratch a line on the INSIDE of a bottle neck.
I twirled it around a few times, back and forth and perhaps too much. Time to tap the line.
At first, I tapped with the heavy end thing that squishes against the outside of the bottle neck. That was a bad idea as the glass cracked off on an angle, definately not on the line. So I got out an ordinary glass cutter and tapped the line with the ball end around until it popped off.
Used tile nippers to nip off the jagged edge.
It looks horrid... not worth even trying to pretty up all nice and smooth. But, I do think I shall clean up this tool and put it to use. The break DID follow the line a little bit, and it might have broke off clean if I had only scratched it one good time and only bopped it with the ball end thing, so I consider this test a success.
I will update this blog after LOTS of practice. Does anyone else have one of these gadgets?