That Bell & Ross GMT is an all time fave of mine!!
One day, I will have one
@JonRGV250 sent me his broken Casio BB-G100 to take a look at, and it arrived yesterday
As it arrived:
Second hand gone for a walk:
Sensor bezel insert was raised:
Button out of place:
But otherwise, it seemed to be working. These large casios with lots of edges often get beaten up a bit, and do tend to look a little dog-eared after a while of use!
First things first, lets take a look at that bezel insert being out of place:
You can see the right side of the top hole is split, this looks like it can be squeezed back into place easily enough:
That looks a little better!
Ok, so lets take a look inside:
Lots of pins/screws and plastics to get through!
Once inside, no signs of water ingress and the shaped o-ring looks in great shape, which will make things easier!
Unclip the sensor from the main movement:
This step is a little fiddly but you just flip up the white clamp, and gently tug out the ribbon, using plastic tweezers to help prevent damage.
With that done, we can liberate the movement from the case, and get a look at the main problem:
You may also see the tiny little metal C-clip (just below the end of the second hand) that fell out whilst removing the movement.
This is good news, as that is what should be holding in the escaped button, so I put it to one side for now.
I re-fitted the second hand, and unknowingly (at this time) this was slightly out of alignment, and I have to correct this later, but once in place, it was ticking well:
I then turned to the problem button, you can see below, when I refitted the right button here, there is nothing to hold it in place, like there is on the left side button:
This is the culprit, and as you can sort of see here, it is slightly "domed" which means it will not work well:
So I gave it a quick flatten with some tweezers, and re-fitted to test, and it held it in as desired... BUT...
This button should have a small spring on the shaft to help with pushing it back after being pressed:
Now, I do not have one, I checked all my spare parts bins, and nothing was close... So I had to work out the correct size, which I did with testing by wrapping some old champagne cork wire (I throw nothing away, precisely for this reason!) onto a few different sized jewellery screwdrivers, like so:
I did a few different tests with this very flimsy wire, before settling on a size that worked:
However, this wire is way to flimsy to work long term, and after a few presses it ceased to spring back. I had anticipated this, and then used a harder pen spring to play with:
After a bit of straightening, and re-winding/cutting, I ended up with this:
Not my tidiest work, but it worked well, and is totally invisible once installed:
So I lubed up the seal:
Its a good idea to do this, as it helps keep the whole thing water-proof, especially when re-using old seals.
Re-fitted it:
Plastic spacer re-fitted:
back together:
When putting the strap back together, I noticed the wrong clasp ring was fitted, so dug through the parts bin, and swapped this out from a broken mud-master model I had spare:
A quick bit of cannibalisation and we have an OEM looking watch strap again
Next to my own recently repaired watch of the same type. Sadly the hands on mine are water-damaged, and finding replacements is taking some time
I put it on to test, and that was when i finally realised the second hand was about half a tick out of alignment, you can sort of see it here:
I also removed all the bezel protection parts, and gave the crystal a quick polish with some polywatch, just to improve it a bit, but some of the scratches are too deep to remove fully at this time.
So, apart it all came again, and I carefully removed/re-fitted the second hand, and paid better attention to the alignment!
That was a lesson learnt, I wont be making that mistake again!
I then reached back out to Jon, and told him it was ready to come back, and he kindly offered to let me keep the watch as I had done the work, and it was unlikely to be worn again by him, I think I will do that! Especially as the hands are in much better nick than the one already in my collection!
@JonRGV250 - Thanks for letting me look at the watch, and also for your generous gift!!