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PostPosted: Tue Jan 22, 2013 4:26 pm 
Posh Mark
Posh Mark
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Joined: Wed Apr 18, 2007 2:49 pm
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Location: As far from the city as you can be ....
Hi All,

I have a pair of Marzochhi forks with the removable brace.

Sadly one of the bolts rounded out so badly I had no option but to cut the head odd.

This has left me with about 5-7mm of thread in the body of the fork with no means of purchase :roll:

I have cut a groove into the thread but even then I cannot get any purchase on it with a screw driver. :evil: :evil:

I think the only way would be to drill out the bolt and maybe re tap - sadly I don't have the bits for this.

Can anyone help if I sent them the leg?

Thanks in advance,

Mark


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PostPosted: Tue Jan 22, 2013 4:40 pm 
retrobike rider / Gold Trader
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Joined: Sat Jan 27, 2007 10:35 pm
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Location: The desolate flats of Cambridgeshire
First try an easy out, depending on the bolt dia, a hole will be drilled into the bolt (I'd recommend using a left hand drill bit if available as this alone may work the threa out, if not...) then use the appropriate size easy out. Easy outs are prone to snapping if not used correctly especially the smaller sized ones. And they can be very tough to drill through.

Failing that drilling and re threading to the next size up may be an option but depending on theatrical where the hole is situated, a helix oil may be recommended.

I have taps and drills but don't at the moment have smaller easy outs (snapped ;) ) and also prefer to do smaller thread sizes in a more controlable drill set up to ensure the drill is coaxial to the fixing etc. which I don't currently have available to me, however I hope the advice is useful.


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PostPosted: Tue Jan 22, 2013 4:45 pm 
Posh Mark
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Joined: Wed Apr 18, 2007 2:49 pm
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Location: As far from the city as you can be ....
If I could get away with it not re tapping up a size would be great. I think if this happened I would have to drill the brace too.

Will see if I can hunt out an easy out bit ....


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PostPosted: Tue Jan 22, 2013 5:24 pm 
retrobike rider / Gold Trader
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Location: At the pinnacle of fuckwittery
A good local engineering firm will have them, they might just let you use them for free, on site. Or they might just do it for a small fee.

Just a thought


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PostPosted: Tue Jan 22, 2013 5:51 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
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Joined: Mon Aug 31, 2009 12:26 am
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Location: Rurally close.
Use the corner of a screwdriver and whack it round with a hammer. Dig the corner of the screw driver in (to the slot now i guess).


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PostPosted: Tue Jan 22, 2013 5:55 pm 
Gold Trader
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Joined: Sat Aug 18, 2007 12:28 pm
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Location: The Admiral Benbow
Grabit screw remover, best thing in my tool kit :wink:


Last edited by lumos2000 on Tue Jan 22, 2013 10:50 pm, edited 1 time in total.

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PostPosted: Tue Jan 22, 2013 10:28 pm 
retrobike rider / Gold Trader
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Joined: Sat Jun 20, 2009 3:45 pm
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Location: Birmingham
http://www.screwfix.com/p/screw-extractor-set/18643


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PostPosted: Tue Jan 22, 2013 10:33 pm 
Retro Guru

Joined: Sat Jul 04, 2009 4:41 pm
Posts: 1696
an engineering place near me removed the broken bolt from my throttle clamp the bolt was m4 he drilled it out an inserted a time sert into the hole
(google timesert they work very well)

the clamp has 2 bolts now when just the new bolt is tightened it clamps fully to the bar an doesnt move its alot stronger than the standard bolts

whats your location
if all else fails i dont mind taking down there for you 8)


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PostPosted: Tue Jan 22, 2013 10:49 pm 
Gold Trader
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Location: The Admiral Benbow
Charlieboy28 wrote:
http://www.screwfix.com/p/screw-extractor-set/18643


my problem with these is this

Quote:
Simply drill a pilot hole in the broken fixing and screw in the LH threaded extractor for easy removal of broken screws and bolts.


has anyone ever "simply" drilled a pilot hole in a screw? its bloody difficult and youll need a decent drill bit to start with, youll probley end up slipping and damaging the surounding material, well i do anyway. the Grabits are much better


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PostPosted: Tue Jan 22, 2013 10:56 pm 
Retro Guru
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Joined: Mon Jan 02, 2012 10:04 pm
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Location: cornwall
lumos2000 wrote:

has anyone ever "simply" drilled a pilot hole in a screw? its bloody difficult and youll need a decent drill bit to start with, youll probley end up slipping and damaging the surounding material, well i do anyway. the Grabits are much better


Piece of piss, do it all the time, decent bits are a must as are a centre punched 'stump'

I also have issue with them though. They are prone to snapping, leaving you with an undrillable mess. I prefer to drill out to standard tap size, then chase the remaining threads out with a proper tap. Easier if you can get the item on the bed of a drill press or even better a mill.


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