I'm trying to mount a geocache on a string inside a pole that looks like this:


Can you suggest me an idea how to attach the string to the pole without drilling anything to the pole?

The dimensions are:

  • Width: 44,5 mm
  • Height: 49,5 mm
  • Depth: about 70 cm

Also, what can I do to secure it from falling down (the pole is hollow)?

  • What about a rubber cork? it seems to angle upwards so push it in, push a cork into the end voila!
    – user2766
    Commented Sep 21, 2015 at 8:09
  • 4
    Frist you should ask yourself: "Why is there this hole?" If it is e.g. for water draining, it wont be the best idea to plug it.
    – Phab
    Commented Sep 21, 2015 at 8:17
  • Tie your string to a wad of duct tape and stuff it in the hole.
    – ShemSeger
    Commented Sep 21, 2015 at 20:14
  • @Liam I instantly thought of that idea, but I don't know how to make it, and, would be difficult to mask so that muggles don't spot it.
    – redbeam_
    Commented Sep 21, 2015 at 20:17
  • You could paint it/get a concrete grey one?
    – user2766
    Commented Sep 22, 2015 at 8:23

4 Answers 4


What's the width of the hole? I'm thinking of a mounting system like a wall socket. Spread it aginst the inner surface. Then tie the cach on it.

Or the very low cost variant: Just use a piece of wire and bend it accordingly

enter image description here


A hook/eyelet toggle bolt could work, depending on the weight of the cache:

enter image description here

If you unscrew the toggles and reverse them, the hook would be on the inside holding the string, and you would reach in with two fingers and squeeze the toggles to extract the cache. Much cheaper than a climbing cam, but the same idea!


I think what I would use would be a Rubber Washer:

Rubber Washer

If you got a ~45mm rubber washer, you could tie your string to the washer, then put it into the hole one of two ways: either shove the washer in as deep as you can just to hold the string in place, or you could put your cache in first, then "plug" the hole with the washer. You could recess it completely in the hole so nothing is hanging out, it's black, so it won't draw a lot of attention from passers-by who may glance up into the dark hole in the pole, and the hole in the middle will make it easy for some one to stick their finger in it and pull it out.


It already has a hole in it, what if you used a cam? Not exactly the cheapest method but potentially the easiest.

enter image description here

Edit: if you found the perfect size Tricam that might be a less expensive option

enter image description here

  • 1
    Wow, your must be very rich! That's set you back at least £60! Also it'd need to hang out so you could access the trigger. If you can't pull the trigger you won't get it out
    – user2766
    Commented Sep 21, 2015 at 8:07
  • 1
    That would stay there until maybe the next geocacher came by, then it would be gone and replaced by something else. But most likely someone would take it as climbing booty and leave your cache on the ground.
    – ShemSeger
    Commented Sep 21, 2015 at 20:11

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.