I sent my bellows in a few weeks ago (after I was allowed back into the yard to swap new for old).
I don't really expect to hear back from them, but hope they use it to further improve their composition.
New one is installed and ready to go.
FYI, I made a "bellows" compressor from a disk brake spreader. It made the job of getting the
3/4" compression VERY easy in an otherwise cramped space. The tool was pretty cheap from
amazon and I just drilling 1-1/8" half hole through both the spreader "paddles" so it fit a little
bit over half way around the shaft.