Rounded pinch bolt - Mc Master Carr to the Rescue - MVAgusta.net
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post #1 of 25 (permalink) Old 12-21-2013, 07:58 PM Thread Starter
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Rounded pinch bolt - Mc Master Carr to the Rescue

I discovered on my newly purchased Brutale that the chain was way to tight.
Trying to loosen the pinch bolts unveiled that the hexagon of one pinch bolt socket was round.
An ordinary retractor from ACE hardware leaded, because of the small square end, to a broken 7mm spanner, a slipping trough 12 point socket, other broken things and scraped off skin on my thumb.
The pinch bolt didn't move at all.
So I went to McMaster again and ordered the One Step socket bolt extractor kit.
Yesterday evening the kit arrived.
Today the bolt was history, no drilling required, the 12mm extractor worked like a charm.
Just to let You guys know what You need in Your tool box.
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post #2 of 25 (permalink) Old 12-21-2013, 08:59 PM
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picture of the tool used would be great

cheers eddy
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post #3 of 25 (permalink) Old 12-22-2013, 12:17 AM
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You can see them in the blue pouch in the photo and the 12mm tool is fitted into the socket head screw on the swingarm. He bought a metric set. Lots of good stuff from McMaster-Carr: I've been buying from them for over 30 years and never been disappointed.

Eric
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post #4 of 25 (permalink) Old 12-22-2013, 01:34 AM
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Quote:
Originally Posted by haupti View Post
I discovered on my newly purchased Brutale that the chain was way to tight.
Trying to loosen the pinch bolts unveiled that the hexagon of one pinch bolt socket was round.
An ordinary retractor from ACE hardware leaded, because of the small square end, to a broken 7mm spanner, a slipping trough 12 point socket, other broken things and scraped off skin on my thumb.
The pinch bolt didn't move at all.
So I went to McMaster again and ordered the One Step socket bolt extractor kit.
Yesterday evening the kit arrived.
Today the bolt was history, no drilling required, the 12mm extractor worked like a charm.
Just to let You guys know what You need in Your tool box.
Well done,thanks for sharing


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post #5 of 25 (permalink) Old 12-22-2013, 01:46 AM
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You have the patience of Job to wait for tools. I would have had the drill out with many curses and probably caused myself much more work. Hats off to you sir

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post #6 of 25 (permalink) Old 12-22-2013, 10:36 AM
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I'm having trouble seeing how this "tool" would work. It appears they are simple hex keys(hex bar stock) that one would beat into the rounded hole and then once firmly seated into the marred metal use a wrench to back out the bolt like using a normal socket drive, yes?
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post #7 of 25 (permalink) Old 12-22-2013, 10:53 AM
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Quote:
Originally Posted by varium View Post
I'm having trouble seeing how this "tool" would work. It appears they are simple hex keys(hex bar stock) that one would beat into the rounded hole and then once firmly seated into the marred metal use a wrench to back out the bolt like using a normal socket drive, yes?
That's about the gist of it I believe

One can't help but wonder how on earth a brand new pinch bolt would be so tight as to round out the hex. I have worked on many hundreds of MV Bolts and the metal has never rounded off like that...The plating is rubbish but the steel seems to be pretty good.

joe
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post #8 of 25 (permalink) Old 12-22-2013, 11:50 AM
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Quote:
Originally Posted by varium View Post
I'm having trouble seeing how this "tool" would work. It appears they are simple hex keys(hex bar stock) that one would beat into the rounded hole and then once firmly seated into the marred metal use a wrench to back out the bolt like using a normal socket drive, yes?
Extremely hard steel, slight taper on the end to insert into the socket recess. Some come with spiral fltes that pull the tool in as it os turned anti-clockwise.
There is another variation that goes over the outside of the bolt head with internal spirals that pull it down onto the bolt as you turn anti-clockwise. Frequently used to remove "anti-theft" wheel lug nuts with striped out internal splines (or to allow a thief to nick your trick wheels).
Sears sells them, among other companies.

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post #9 of 25 (permalink) Old 12-22-2013, 11:59 AM
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Interesting and good suggestion! I did not know this tool at all... But that's me of course

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post #10 of 25 (permalink) Old 12-22-2013, 12:12 PM
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If the pinch bolt was that tight then I suspect the bearings in the hub to be suspect. Certainly if it were mine I would be pulling it out and replacing the double row bearing and a good inspection of the remains. lots of grease and a re-build.

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