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un-hexed an Ultegra Br-6600 Centering Screw, anyone know where to get a replacement?

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un-hexed an Ultegra Br-6600 Centering Screw, anyone know where to get a replacement?

Old 05-26-13, 06:24 AM
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un-hexed an Ultegra Br-6600 Centering Screw, anyone know where to get a replacement?

As the title implies, I took a hex wrench to the centering screw of an Ultegra 6600 brake caliper, went a bit too tight on the adjustment, and %$#@, the hex ridges turned into a circle.

Problem #1: how do I take the screw out?
Problem #2: Where can I get a replacement, preferably with a phillips head?
Problem #3: Is my hex set's material too hard?

Thanks, this isn't the first time this has happened, last time was with the dust caps on the bottom bracket. Always the little things...
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Old 05-26-13, 06:39 AM
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1. Try to find a small Torx driver that's a snug fit in the hex (or former hex) recess. Sometimes these will bite when a hex key won't
2. Once you get the bolt out, take it to a hardware store that sells metric bolts and find a match. I assume it's a relatively short M3 or M4 bolt.
3. Your hex keys aren't too hard but may be too worn. Hex keys in general and small ones in particular get worn, lose their sharp edges and do just what you experienced. They are not a lifetime purchase and should be replace periodically.

4. Actually, there is no reason to use those centering screws for any caliper brake set, particularly double pivot types. You can easily set the pad clearance with the cable adjuster and center the pads by rotating the entire caliper by hand. I've installed and adjusted dozens of caliper brake sets and never once touched those centering screws. Cantilever and V-brakes do require using the centering/tension screws but not road calipers.
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Old 05-26-13, 07:58 AM
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Besides Hillrider's removal ideas, you might be able to saw or Dremel a slot in the screw to remove it, or epoxy a sacrificial driver into the rounded-out slot. A slightly larger fractional-sized driver may also be forced into the recess.

Worn hex keys are common and while cheap to replace, you can often get a little more life out of them by grinding the worn end off flat to expose new, sharper driving edges.
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Old 05-26-13, 03:41 PM
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Originally Posted by HillRider View Post
Actually, there is no reason to use those centering screws for any caliper brake set, particularly double pivot types. You can easily set the pad clearance with the cable adjuster and center the pads by rotating the entire caliper by hand. I've installed and adjusted dozens of caliper brake sets and never once touched those centering screws. Cantilever and V-brakes do require using the centering/tension screws but not road calipers.
+1; I just set the screw so the brake looks best and then leave it alone. The mounting bolts don't need to be so tight you can't easily centre the brake by hand. Ditch the paint-ruining star washers.
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