Get yourself a step drill bit which is likely to be easier to open up a hole.
Roof Rail Leak Free Fixing.
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Just my input FWIW. As an Engineer who’s worked on ‘liquid/air systems’ in my career from Low Pressure domestic water and gas, to fully automated High Pressure hydraulic system circa 3200 psi, when I fitted my ARB Baserack I massively over thought the ‘will it leak’ paranoia.
Then in a moment of clarity I just said ‘used the tried and tested principles you used in the above systems to great effect and keep it simple!!’
For roof rail, roof rack etc fitting that bolts into the existing roof mount threads I would simply use a good quality rubber spacer, or flat seal to suit your application and use some good quality liquid PTFE.
I rate this stuff. I use it on LP water and in a few minutes it forms a W/T seal. I used this on my roof rack bolts along with supplied ‘rubber pad’ from ARB and no issue. Also used it on other friends VW roof blank bolts as a precaution and 18 months later they too say previously leaking bolts now cured.
We are all guilty of overthinking it sometimes ( jeeeeeez. I’m the worst
) but often a simple proprietary solution with less points of failure is best.
just my ‘go to’. HTH
Then in a moment of clarity I just said ‘used the tried and tested principles you used in the above systems to great effect and keep it simple!!’
For roof rail, roof rack etc fitting that bolts into the existing roof mount threads I would simply use a good quality rubber spacer, or flat seal to suit your application and use some good quality liquid PTFE.
I rate this stuff. I use it on LP water and in a few minutes it forms a W/T seal. I used this on my roof rack bolts along with supplied ‘rubber pad’ from ARB and no issue. Also used it on other friends VW roof blank bolts as a precaution and 18 months later they too say previously leaking bolts now cured.
We are all guilty of overthinking it sometimes ( jeeeeeez. I’m the worst
) but often a simple proprietary solution with less points of failure is best.just my ‘go to’. HTH
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