I have a kidney holed cover that no one seems to want to buy, so is it valueless?
I also have a cable cover coming to the market very soon (maybe Wednesday), which is a repaired item, it was very badly cut by hand (that has been filled in with alloy sheet, and the round hole filled in as well), it is currently on my mates mill having a slot barely bigger than the M Cox supplied stainless arm and will give you more "extra leverage" than a DAM conversion. You really should keep the oval cover with the bike (just my take).
If you are interested, I will send you photos and I am sure my wheels will get cheaper, question is ???? by how much
CLEM