Bottle Top/cap Knob

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Intro: Bottle Top/cap Knob

This is a cheap and easy to make knob, using just an ordinary plastic soft drink bottle top, a bolt, a nut and two washers.

It is especially suitable for projects where a bolt needs to be turned to adjust something.

I'm actually surprised that a similar instructable has not yet been published, as it seems such an obvious idea. My sincerest apologies if it has indeed previously been published and I missed it.

Step 1: The Parts

The picture shows all the parts necessary. Actually bigger washers would be better for a tighter grip on the bottle top.

Step 2: Preparing the Bottle Top

Just drill a hole in the centre of the bottle top the size of the bolt you're going to use.

Step 3: Assembly

The first picture shows the order in which the parts fit together. Then just tighten the nut very tightly. A lock nut is preferable, and you can of course also add glue to help avoid slippage. I usually use an ordinary nut, and lock it by damaging the bolt's thread beforehand with a metal punch (second picture).

Step 4: Finished

The first picture shows the finished knob. You can of course also use different size tops (second picture) for the appropriate torque/control you need.

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    10 Discussions

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    guy90

    2 years ago

    There's soo many articles on what to do with plastic bottles out there, but hardly any on reusing the caps! Great little instructable this, can't believe I never thought of it. Thank you for sharing this

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    mxxguy90

    Reply 2 years ago

    Guy90, thanks. And it's also very satisfying to find a use for common items like these. It seems a shame to just throw them away.

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    Uncle Kudzu

    3 years ago

    Excellent re-purpose! I'll be using this for my homemade pinhole cameras. Thanks for sharing your idea.

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    caitlinsdad

    3 years ago on Introduction

    This is a great idea. I think I would pack the empty bottle cap with an epoxy putty for a permanent fill to make it a real handle cap/knob. Thanks.

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    mxxcaitlinsdad

    Reply 3 years ago on Introduction

    Catlinsdad, you're quite right, using epoxy putty or glue to fill the cap should work very well.

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    24Eng

    3 years ago

    Great job repurposing a simple item. I wish I had thought of it. It's so obvious now that you point it out.

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    mxx24Eng

    Reply 3 years ago on Introduction

    24Eng, yes, it has always bothered me that bottle tops just get thrown away, and this is at least one way in which to use them again.