>
>
> 2. When I tighten the stays to the dropouts, it over straightens the tail 
> and it winds up twisting the other way. Weird.
>
>
This is caused because the fender and stays are not stress relieved 
(pre-bent).  They are not assuming the final shape you want them to before 
they are bolted up.  By bolting, you are forcing a conformation change that 
creates tensions that change the conformations elsewhere along the system. 
You need to pre-bend (stress relieve) not only the fender but also the 
stays before you clamp/bolt them to the bike.  Did you bend the stays such 
that where they slide into the R-clips at the dropouts, they are parallel 
with the center line of the bike (i.e., parallel with the face of the 
dropout eyelet)? You literally need to create a kink in the stay near the 
dropout to accomplish this. Because if you don't pre-bend them to be 
parallel, the R-clamp will force a parallel conformation, causing stress 
transfer along the stay to the fender, and causing all sorts of weird 
alignment changes.

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