Hi,
I just bought a silver SM4U mouthpiece. The mouthpiece is slight loose in the receiver. I have to push it in to get it to fit snugly. I do not have that issue with the 4AL. Anyone experience this. Playing a Mack Brass Euph but have been using a 4AL for 3 years on it with no issues. Just curious. I like the mouthpiece but don't like that I have to "snug it up" so to speak to get it to fit firmly.