Well it's not often that I am stumped but I was digging through a box of HS40 cranks and ran across these GEM WB820 transfer port covers. Well I just was pulling them out of the bag to count them and I noticed that some of them are different on the inside. I tried calling Dave Bonbright but got his answering machine soo I figured I would post here and maybe someone will know what the deal is with these. Ya Dave will probably get back to me soon enough but curiosity is getting the best of me-
