My Easy Accent decorator is spewing out the seams! I have had it for a few years & never used. So when I signed up to be a consultant, I wanted to learn how to use. Well I put some cool whip in it, put on a tip and squeezed, and it also was squeezing out thread between the tip holder & barrel. Has this product improved over the past couple years where there is threads to hold on the tip? Mine doesn't "thread" on, it just turns & clicks.