I have a few of them and I dont know, but for some reason a few of them the inner resin has expanded and they split at the top of the body. They still work fine, but I was just passing this along incase your quality control guys wanted to know. The other thing is, I see I can buy 2/0 and 3/0 stinger hooks that came on the smaller waxwings, but I cant find the size that comes with the senior. The Owner catalog only lists the 2/0 and 3/0. Is there a replacement hook for the senior size?
If the jigs have split then send them in for warranty replacement. They should not split like you have described.
Owner makes the hooks. They have not offered the larger sizes in the US for replacements yet. I am not sure when they will.