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I have a standard 5v

enter image description here

I am using the horn it came with it, I mean this piece:

enter image description here

Like the long arm in the middle. Each of its holes are 1mm diameter.

Then I have a 3d printed crankshaft I did:

enter image description here

Its holes are also 1 mm. So while the servo horn is attached to the servo, I attach this crank to the horn in order to lift or lower a small scructure.

What I am not sure is hot to connect these 2 pieces (horn and 3d printed crankshaft). So far I have been using a paper clip, and at both end of it I placed 2 blobs of tin using a soldering iron. This has worked for nearly a year, but today I failed, and I was wondering if there's something more specific for my problem, which seems something common.

I have seen some people use something called Dubro EZ connector, but it seems an overkill, plus it won't have space for my 3D printed piece. Some people seems to use a clevis pin, but I cannot find any with a diameter of less than 1.

So my question is, how can I fix it? What can I put at both ends to stop if from slipping away? I have already tried simple things like simply bending it.

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    $\begingroup$ Why wouldn't a nut and bolt work in this situation? Why isn't drilling a larger hole an option? If clevis pins aren't available in such a small size, did you look at retaining rings (circlips)? $\endgroup$
    – Ian
    Jun 5, 2014 at 20:53
  • $\begingroup$ Thank you very much for your answer. I cannot use bolt and nut because I need the bolt to be flat in order to allow for rotation. I can get bolts with a flat part, but not as small as I need. Regarding the circlips, thank you, I didn't know they existed, but I am having a similar problem, because I need like 1 mm diameter. $\endgroup$
    – Dr Sokoban
    Jun 18, 2014 at 13:59
  • $\begingroup$ Rivets might also be something to check out. $\endgroup$
    – Ian
    Jun 18, 2014 at 22:05
  • $\begingroup$ Thank you for your tip. I had to check what's a rivet. it seems I would need a gun, which I don't have, and they might tight too tightly. $\endgroup$
    – Dr Sokoban
    Jul 8, 2014 at 14:49
  • $\begingroup$ @DrSokoban, did you finally come up with a solution? If so, do not hesitate to write up an answer for your own question. This way, future visitors would also benefit from your solution. $\endgroup$
    – Shahbaz
    Mar 6, 2015 at 16:01

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