Wavshrdr,
Could you post some photos of the problem? What's the "spoke guard" you're speaking of? (the only thing that came to mind was the dork-disk but that wouldn't be attached to a derailleur) Also, what's the bracket you're referring to. (picture worth a thousand words ;)
I was surprised when I read your previous post expressing difficulty with the derailleur and shifter; I hadn't heard of anyone having such problems with the Downtube before so I figured perhaps it was a setup issue or, as you've indicated, something out-of-whack.
C.J.