CityCyclingEdinburgh Forum » Questions/Support/Help

Protecting shock cord running through a hole drilling in CF seat

(11 posts)
  • Started 6 years ago by Darkerside
  • Latest reply from NiallA
  • This topic is not resolved

No tags yet.


  1. Darkerside
    Member

    Catchy title, eh?

    I had a Cunning Plan yesterday to store my tool roll (stumpy water-bottle sized) under the recumbent seat. It fits exactly between two spines that run the length of the seat, so my intention is to drill four holes through the carbon fibre, run some shock cord (/bungee) through those to create two elasticated loops, and subsequently revel in my brilliance.

    Some further thought has suggested that shock cord running through said holes is going to have a limited lifspan unless there's something protecting it. I think I need something like a washer with a sleeve to fit through the hole. In fact, something like this:

    https://www.muirskate.com/longboard/products/63851/array-machined-cone-sleeved-washer-combo-pack-four-pack

    Unfortunately, I can't find anything like that in the UK (probably because "washer with sleeve" isn't a real thing).

    Any thoughts, oh great hive mind?

    Posted 6 years ago #

  2. Fionam
    Member

    Hi - long term lurker here, but finally got my log-in account.

    @Darkerside; What about a plastic grommet - would offer better protection I would imagine than metal. Something like this perhaps :

    https://www.sinclair-rush.co.uk/category/244/standard-grommets---pvc

    That company makes all sorts of cool tube type stuff (we use them at work) so I'm sure you'd find something there to help.

    Posted 6 years ago #

  3. dessert rat
    Member

    Wallace and ....

    Posted 6 years ago #

  4. Darkerside
    Member

    Grommet would seem to be the magic word then - thanks both.

    Plastic I wouldn't be able to fit in (as in, I'd have to drill a keyhole shape to slide the grommet down into, and I'd rather minimise the amount of seat removed). Rubber would hopefully work if it's flexible enough, I just wonder whether the friction would be too high to allow th cord to slide easily through it...

    Posted 6 years ago #

  5. dessert rat
    Member

    put the cord through, then push the grommets into place - def wont work the other way round

    Posted 6 years ago #

  6. Fionam
    Member

    The PVC would I think be "squishy", so I don't think you'd need a keyhole shape, but it would need quite a big hole in your carbon seat. (4.8mm is the smallest hole they say can grommit up!) Grommet might also stick into your back when fitted.

    Or, you could use a bit of heatshrink tubing to protect just the bit of cord that goes through the raw hole.

    Posted 6 years ago #

  7. Roibeard
    Member

    Darkerside - you might also see "gland" from electrician suppliers. These are like solid grommets, which can be used to seal a "spare" hole in an electrical box, or provide a waterproof port in the box. The electrical cable being simply pushed through the gland, with the centre section being flexible enough to close around the cable.

    Sometimes a gland will be described as a closed grommet!

    Robert

    Posted 6 years ago #

  8. I were right about that saddle
    Member

    @Fionam - welcome!

    @Darkerside

    How thick is the carbon fibre? I've used brass eyeleting kits in the past to protect shock cord passing through thin stuff.

    Posted 6 years ago #

  9. urchaidh
    Member

    Drill hole 1mm bigger than required, fill hole with sugru (or similar) leaving small cap on each side, re-drill sugru at required diameter and thread cord?

    Maybe too difficult to center second drill accurately enough.

    Posted 6 years ago #

  10. Darkerside
    Member

    Sugru is an excellent thought, particularly as I have a few sachets lying around.

    Thanks all for participating in this thought experiment - I shall report back at some point with progress.

    Posted 6 years ago #

  11. NiallA
    Member

    Could you superglue some Velcro "ties" in place to avoid drilling at all?

    Posted 6 years ago #

RSS feed for this topic

Reply

You must log in to post.


Video embedded using Easy Video Embed plugin