The credit card grappling hook is a whimsical little project that combines a credit card, some simple hardware, fishing line thread, and a sewing machine bobbin.  It's functional for light grappling duties, but is mostly just meant to be used as a toy and for entertainment.

Step 1: Materials

The first step is to gather the materials.
  • 2 credit cards
  • fishing line
  • rubber band
  • sewing machine bobbin
  • bolt
  • 2 nuts
  • wing nut
  • 3/16" binding post to fit bobbin

Step 2: Attach fishing line to hook

Using a larks head, attach one end of the fishing line to the grappling hook.  Assemble the grappling hook so it matches the one in the photos below.

Step 3: Wind bobbin

Wind the fishing line around the sewing bobbin just like you would wind thread on the sewing machine.  This is a fast, clean and easy way to load up your spool with many feet grappling line.

Step 4: Tape two cards together

The structure for the grappling hook is basically just the credit card itself, so in order to keep it stiff and strong, I used double sided tape to stick two cards together.

Step 5: Drill holes

Drill holes in the card for the hook launcher (rubber band) and the binding post that will hold the cable spool (sewing bobbin).

Step 6: Attatch spool to card

Attach the bobbin to the card using the binding post and then loop the rubber band through the top hole to create the elastic launcher.  I made a slight dimple in the back edge of the card that the rubber band fits into which allows me to easily stow the grappling hook when it's not in use.

The last steps are to go shoot at stuff, try to real it in, and to have fun!

so how does the hook retract?
<p>ur hand lol</p>
how far can it shoot?
I like it. Imagine over-the-wall cubicle treasure hunts--snag it and you get to keep it ! But, as the safety rep, I would love to find this on someone's desk. I'd have a good presentation at the next quarterly. Remember...It's all fun and games until someone loses an eye.
losing a nut isnt fun either
Totally wizard!
THAT IS AWSOME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! You can hook lots of cool stuff with that thing.<br><br><br>:p tottaly rad man
y de que utilidad es este artefacto.<br />
Este artefacto es un&nbsp;aparato para subir paredes come si uno fuera un super-espia, pero solo sirve para arrastrar sillas or terrorizar a su gato :)
Dude I love google translate!<br />
isnt it beastly???
<span class="short_text" id="result_box"><span title="Ha you're right!">Ha tienes raz&oacute;n! </span><span title="They should make a bigger version...">Deben hacer una versi&oacute;n m&aacute;s grande ...</span></span>
Saludos Dariokastro !<br /> &nbsp; Este artefacto, lo puedes utilizar como rescatador de barcos a escala, que se han quedado varados en alguna piscina, lago, estanque, ETC, &nbsp;por alguna falla.<br /> &nbsp;En &nbsp;nuestro grupo de Modelismo Naval, lo llamamos &quot;*911&quot; (asterisco 911) o &quot;rescatador&quot;, es muy &uacute;til, desdeluego es de un dise&ntilde;o diferente, ya que utilizamos un carrete mas grande, sedal o cord&oacute;n,&nbsp;y una pelotita de esponja en un extremo.- Asi es que yo lo encuentro ideal para este prop&oacute;sito, ya que&nbsp;es de reducido tama&ntilde;o&nbsp;y puedes llevarlo en cualquier bolsillo.<br /> &nbsp;&nbsp;Puedes visitar el&nbsp;sitio en la web, de Modelismo Naval de Reciclado, es muy intresante: http://mx.groups.yahoo.com/group/ppnautica.<br /> Estaremos en contacto<br /> Atte. PPsailor&nbsp;<br /> &nbsp;
what is wrong with the spanish speaking? <br>
i hate how you have a drill press and i dont
Really nice idea. Keep up the AWESOME work!!!!!!!!!!!!
Sew, what is the purpose of this?
absoluty nothing!(no jk its just for fun)&nbsp;
I'm gonna build one and harrass the teacher
ya go grappling hook<br />
this thing is cool<br />
&nbsp;cool! im going to build a few of these for my friends
so what is this supposed ta do?
Wait... Everytime I&nbsp;shoot it (I&nbsp;got one made last night in my sleeplessness)&nbsp;it just hits the card.... How do I&nbsp;fix it. I&nbsp;tried shooting from every angle possible and it always just hits the card or barely misses.<br />
Mine seems to work fine. &nbsp;I just aim like normal with the rubber band hand and then pivot the back of the card down a bit to keep it out of the way.&nbsp; Interesting...I&nbsp;haven't had a collision yet.<br />
I&nbsp;found my problem... my screw/bolt was alot bigger and heavier then the one you used. I&nbsp;went out to the garage and found some smaller/lighter screws/bolts and fixed it. Now it does great&nbsp; :D<br />
:,D wel all i can say is lol-rotc (laughing out loud - rolling on the chair) ...&quot;admin-made credit card ibles&quot;...<br />
What's with the recent burst of admin-made credit card ibles?&nbsp; Did you guys get too many gift cards or something?<br />
We've got a little something going on with Duane Reade.<br /> <br /> http://www.instructables.com/id/Duane-Reade-Loyalty-Card-Reuse-Guide/<br />
As I posted on that main page... because of this spam type little something you've got going on, I won't be shopping at Duane Reade.<br /> <br /> I hate it when companies infiltrate my favorite sites, even moreso when their services or products have nothing to do with the site!<br />
&nbsp;i am swinging on my bunk bed yay&nbsp;<br /> jk Still fun
hahaha thats really cool,<br /> You could sharpen the wings of that nut to make them grip more and superglue a match to the bobbin to use as a handle to wind it in.<br /> <br /> very nice 5/5<br />
You there!&nbsp;Stop larking about with credit cards and get some real work done!<br /> <br /> Wait did you say grappling hook? 5/5!<br />
The second I&nbsp;find an old card or two I'm making one :D<br />
heh-heh-&nbsp;heh-&nbsp;heh...heh-&nbsp;heh...BUWAHAHAH<br /> oh the fun you could have with this little guy :D&nbsp;

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Bio: I've worked for Instructables off and on since 2006 building and documenting just about everything I enjoy doing. I am now the Creative Programs ... More »
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