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From: Jeff Liebermann <jeffl@cruzio.com>
Newsgroups: rec.bicycles.tech
Subject: Re: Bike computer issue garmin
Date: Mon, 06 Jan 2025 15:51:27 -0800
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On Mon, 6 Jan 2025 16:02:57 -0600, Mark J cleary
<mcleary08@comcast.net> wrote:

>On 1/6/2025 3:43 PM, Jeff Liebermann wrote:
>> On Mon, 06 Jan 2025 03:16:52 -0500, Catrike Rider
>> <soloman@old.bikers.org> wrote:
>>> On Sun, 05 Jan 2025 13:59:30 -0800, Jeff Liebermann <jeffl@cruzio.com>
>> 
>>>> <https://felixwong.com/2021/10/how-to-repair-broken-garmin-watchband-pin-supports-ears/>
>> 
>>>> Since the case is already ruined, you might consider just gluing the
>>>> strap to the case.
>>>>
>>>> If all else fails, make a replacement strap from Velcro.  Form a loop
>>>> around your wrist.  Glue the watch to the strap in whatever manner
>>>> looks best.
>>>
>>> That would disable the watche's sensory capabilities unless there was
>>> a large enough opening in the velcro so the sensors in the center of
>>> the backplate could contact the skin.
>> 
>> Good point.  The sensor area is best left uncovered by Velcro.  Also,
>> Velcro sandwiched between the wrist and the watch will likely be too
>> thick and uncomfortable.
>> 
>> The sensor area is fairly small.  See photo in above URL.  Just glue a
>> thin strap to the area between the edge of the case and the circular
>> edge of the sensors.  Or, use an extra wide thin strap, that covers
>> the entire bottom of the watch case, with a hole punched out around
>> the sensors.
>> 
>> If it were my watch, I would try to reconstruct the broken area using
>> one of the moldable plastic epoxy putty products available.  I don't
>> have a suggestion as to which one is best.  The watch band will
>> probably be in tension while worn, so some internal reinforcement wire
>> or wire mesh might be useful.  I have a plastic welding kit that comes
>> with a smalls supply of such mesh.
>> <https://www.google.com/search?num=10&q=plastic+welding+mesh&udm=2>
>> 

>I bought a used case from ali express for $15 and will take it apart and 
>see if I can get it fixed. It is worth the try and B7000 adhesive 
>softens at a low temp. I watch the video of how it is done. I did call 
>Garmin they can only offer me a %20 discount on a new product. I may 
>take them up on it but right now some decent deals on a Garmin 945 and 745.

The used case seems like a good way to fix the problem.  It should
also be the easiest.

I'm not a big fan of B7000 adhesive.  It's a pre-mixed resin adhesive
that relies on the evaporation of the solvent to cure.  The result is
that it's not very viscous and tends to drip.  Here's a discussion
that might help:
<https://www.quora.com/Which-glue-is-better-E6000-or-B7000>
<https://www.quora.com/What-is-the-difference-between-E6000-F6000-B6000-B7000-and-similar-glues>
None of these adhesives should be use for molding the missing pieces
of the watch case.  I shouldn't be making a recommendation without
first knowing which type of plastic and filler is used in the watch
case.  Offhand, I prefer E6000 mostly because tolerates a large
temperature range.

Good luck.



-- 
Jeff Liebermann                 jeffl@cruzio.com
PO Box 272      http://www.LearnByDestroying.com
Ben Lomond CA 95005-0272
Skype: JeffLiebermann      AE6KS    831-336-2558