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Author Topic: How do I increase size of hole in seatpost to take larger bolt?  (Read 954 times)

citoyen

  • Occasionally rides a bike
How do I increase size of hole in seatpost to take larger bolt?
« on: 17 July, 2010, 08:11:36 pm »
I need to make the hole in the top of a seatpost ever so slightly wider to take an M8 bolt - it was designed for an M6, I think. In any case, the new bolt only just doesn't fit. What's the safest way to do this?

It's aluminium, btw.

d.
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"The future's all yours, you lousy bicycles."

Zoidburg

Re: How do I increase size of hole in seatpost to take larger bolt?
« Reply #1 on: 17 July, 2010, 09:11:51 pm »
I will say no to drilling.

Half round needle file, then polish out with wet and dry wrapped tightly and taped round a pencil.
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citoyen

  • Occasionally rides a bike
Re: How do I increase size of hole in seatpost to take larger bolt?
« Reply #2 on: 17 July, 2010, 10:56:06 pm »
Quote from: Zoidburg on 17 July, 2010, 09:11:51 pm
I will say no to drilling.

That's what I was wary of.

The method you suggest sounds good. I'll try that. Cheers.

d.
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"The future's all yours, you lousy bicycles."

Zoidburg

Re: How do I increase size of hole in seatpost to take larger bolt?
« Reply #3 on: 17 July, 2010, 10:57:58 pm »
Strokes of the file in one direction working around the hole evenly, it's not a saw.

Keep trying it for fit as you go, when you get very close then go at it with the emery paper.
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