Thanks for posting; I'm glad to hear someone benefitted from this. From what I can tell, the Lumotec Oval Plus is now very hard to find (perhaps because of this issue?). It's too bad, however, because the metal toggle switch is very nice.

-D

P.S. You should probably cover the hole, especially if you don't use fenders. A simple way to do this is to thread the screw back in, but use a washer or something to keep it from making the contact. (One last thing: after figuring this out, I realized that the instructions actually recommend doing just this... it's just hard to understand initially because it is a fairly poor translation)