Hello, rookie caterham-owner from Germany here, please be gentle... 😉
Today the speedo on my 275s started working intermittently. After some troubleshooting I noticed, that the speed sensor gear on the right driveshaft had moved about 3-5mm towards the diff, causing the sensor not being able to "see" the teeth. I pried the gear back in place and everything was back to normal, however I'm wondering if there is anything to prevent this from happening again?