single thred bottles

For the last 9 years we bought 12oz glass bottles from the big supplier in New Hampshire with no problems. This season I was going to save a dollar and I bought bottles from a discount bottle supplier in Pa. Big Mistake. We are having a lot of trouble threading the drop lock caps on. And are having problems with leaking. I think the problem is the cheaper bottle has only one thread and the bottles we had always bought have TWO threads on top. Just something to think about when buying bottles. Getting most to work but you cant spend 5min per bottle trying to put a cap on!

george