Re: Cant exhale!
The little Mya's require a pretty light push to purge, you may just be blowing too hard. And, yes, replacing the steel ball bearing with a plastic bb will make it purge a lot easier. Could be that the ball bearing is sticking and it may not be purging properly. The plastic bb's don't seem to stick.
You might check to make sure that the purge valve isn't gunked up, the air has to go somewhere and if the purge valve's holes are plugged, the air is going to go up the downstem instead of out the purge.