Well bugger. I’ve had my trusty Garmin Colorado for 9 years now with no issues.
The Colorado’s menus are accessed and controlled by what Garmin calls the Rock’n’Roller wheel, visible at the top centre of the device.
The Rock’n’Roller wheel just pops into place and is easily removable, but in the 9 years I’ve had it I’ve removed the wheel to clean behind it maybe 3 or 4 times and it’s never popped out on it’s own, however riding along the Cambridge bypass last week I caught a flash of something black out of the corner of my eye and I looked down to see my Rock’n’Roller wheel had gone AWOL.
I’ve contacted Garmin dealers and searched Google/Ebay/Aliexpress and found that the part cost just over $2US, but because the Colorado hasn’t been in production for about 6 years all spare parts stock seem to have been exhausted.