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BrickBox



Member Since: 05 Oct 2021
Location: Wales
Posts: 1068
Wales 2008 Defender 110 Puma 2.4 USW Zermatt Silver
Wiper stalk replacement
Afternoon all,

Could someone please tell me why these two bolts arent just a standard 6mm socket to come undone.

6mm is too small and 7mm Is too big.



Click image to enlarge

Thank you in advance. 2017 5.0 V8 Supercharged RRS SVR
2008 2.4 110 Utility Station Wagon XS.
Post #1075738 19th Sep 2025 4:00pm
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Martin
Site Admin


Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6709
United Kingdom 2015 Defender 90 Puma 2.2 XS CSW Montalcino Red
Almost certainly 1/4" AF - because British Motor Industry Wink  1988 90 Td5 NAS soft top
2015 D90 XS SW
Post #1075741 19th Sep 2025 4:08pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17954
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It will be because they're not ISO metric fasters, they'll be an earlier standard. On a Defender that could be almost anything, from BA to BS, UN to ISO. It's intended to keep us guessing and to keep buying tools.

To be boringly pedantic they're also not actually bolts, they're set screws and most likely thread-forming ,such as a Taptite form.
Post #1075742 19th Sep 2025 4:29pm
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BrickBox



Member Since: 05 Oct 2021
Location: Wales
Posts: 1068
Wales 2008 Defender 110 Puma 2.4 USW Zermatt Silver
Brilliant! Thanks both 🙌🏻

Just another tool to add to the pile. 2017 5.0 V8 Supercharged RRS SVR
2008 2.4 110 Utility Station Wagon XS.
Post #1075744 19th Sep 2025 5:00pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1333
France 2002 Defender 110 Td5 DCPU Chawton White
A metric Crescent Wrench will fit
Post #1075747 19th Sep 2025 5:59pm
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custom90



Member Since: 21 Jan 2010
Location: South West, England.
Posts: 20980
United Kingdom 
Be careful not to over tighten the collar around the steering column, I had a collar on there crack once.
Not by my doing but fatigue over time.

So just a little tip on that, there is a torque setting for tha5 screw which is low in the WSM. I think 1NM.
(Don’t quote me on that).

I know this isn’t the bolts mentioned originally, but worth bearing in mind.

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Post #1075752 19th Sep 2025 6:39pm
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BrickBox



Member Since: 05 Oct 2021
Location: Wales
Posts: 1068
Wales 2008 Defender 110 Puma 2.4 USW Zermatt Silver
I appreciate that, thank you! I would have definitely over tightened it. 2017 5.0 V8 Supercharged RRS SVR
2008 2.4 110 Utility Station Wagon XS.
Post #1075767 19th Sep 2025 9:41pm
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