the fork lock key does not need to be modified at all. it fits right through the hole when mounted. it also comes with two chrome screws that are a tiny bit longer than stock so it can be mounted.
i got it as a gift one christmas from my wife, she says she bought it from jp. it was a few years ago, and i dont see a brand. as for the battery, i replaced it during the winter, so it should be good to go for as lo1ng as batteries last! i had a couple batteries to change, so i stopped in a local jeweler and he did it. cant be hard to swap, he did all 3 watches in about all of 10 minutes.
i tried to do some research as to the brand, and i still don't know. all i know is the chrome finish is still beautiful (i believe it is actually nickel) and this is definitely not one of them chinese ebay specials. i saw them...what garbage!
JFYI, I bought one of these from a company called "Clocks4bikes.com". My guess is it is one of theirs, very good quality. I have bought several differeent ones from them and they all have performed flawlessly. This is a good price on this one.