V Brake question

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I recently mounted XT v-brakes to a Specialized Hardrock frame.

The arms of the brakes will not sit flush to the frame because the
mounting "boss" attached to the frame is wider at the base.

<http://www.skokatt.com/mtb/wrong.jpg>

the original brakes that came with the bike had a wider bottom cutout
that fit perfectly over this "flange"

<http://www.skokatt.com/mtb/right.jpg>

My question is... is it safe to ride with these brakes attached as shown
in the first image? there is about 3/8 of an inch of space between the
top of the boss and the top of the brake arm. They are tightened to the
point that there is no movement except for the parallel linkage. The
stopper pin is set firmly in the middle spring hole.

The bosses don't seem to be welded in place (although the LBS swears they
are) should I replace the bosses or just ride it like I stole it?

--
- Chris -
www.skokatt.com
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