More than likely you will have to dig out the styrofoam inside the helmet. Consider a soldering iron to melt it away. They are the most god awfully hard uncomfortable speakers I’ve ever seen. You should also have 2 sized clips on the headsets. That plug needs to also be pushed in very hard. There’s a number of threads on it.
luckily i dont have to dig out any styro for now , she said it seems ok.. its a snug fit but i imagine it will loosen up a little over time .. biggest problem i have right now is getting the units to stay on side of helmet as it keeps slipping off .. tried both clips bot both have same result , not real keen but may have to dig a little groove on side of helmet for it to bite into : /
could you glue on a thin strip of insertion rubber to hold it