Although I have never tried using one of the E.L.K. howlers, I am really digging the ones you are putting with the horns!
Love the transition from mouthpiece to horn...looks very "natural".
Curious (if you don't mind)......are you taking the mouthpieces off from factory Power Howlers?
Or, is a person able to buy the mouthpieces by themselves, from E.L.K.?
{I don't see the parts listed on their site...only the replacement bands.}
{BTW, I am not asking these questions with then intention of trying to cut in on your turf. I am just curious. I haven't even seen a Power Howler in person @ a local store. Being an open reed howler guy, I would probably not even be able to work one of those latex ones.}