Jig

Williams are nearby - you could try them. https://www.williamsautomobiles.com/

They drill them out at the factory apparently. I spent an hour on that one, opening it up a little by little until it fitted, not wanting to go too mad, but ended up drilling it completely to fit.

I have exactly the same problem as the OP on my 310. Had a fiddle around and everything seems connected ok, but the DRE shift lights are not working. Keen to see if anyone finds an answer.

I knocked my white inner off when assembling the first time. Drifted it out with a socket and then reassembled it no problem (well, it is fiddly).

I think the IVA manual says that the wing needs to be level with the front edge of the wheel rim: http://www.itbear.co.uk:8080/images/Caterham/IMGP2070.JPG

The good news is that this is one of the hardest bits of the whole build - it get's easier after this! I wrestled for days with the damn headlight wiring, destroying a number of grommets in the process.

Check out polevolt: https://www.polevolt.co.uk/acatalog/Standard_Relay_Holder.html

https://www.screwfix.com/p/arctic-products-metric-o-ring-selection-box-225-pcs/4312j

I didn't want to drill my screen frame in case I changed my mind about the Racetech mirrors so I looked for another answer and found it: You want Racetech RTMPM (available from Demo Tweeks and Rally Design. These are pillar mounts that replace the end fitting that comes with the mirror, and appear to be designed for Caterhams. They come with an M5 set screw, just needs a few mm cutting off the length (I simply measured the original screw that I removed) and you are away. Look neat, as well, so for 15 quid, it's an easy choice.

Great spot - so 'collar spacer' is the magic phrase. All seems to be one eBay vendor who has cleared a seatbelt factory! I'll contact him with my dimensions and see what he has available. Cheers.

Thanks Jonathan I do have access to a lathe so I may end up making some spacers if I cannot buy anything off the shelf. Cheers, Jig.

Thanks for the comments chaps. Anyone have a good supplier for the spacers?

This must have been discussed before but I cannot find any threads. Is there a safe way to fit a harness whilst retaining the inertia reel seat belts? obviously the shoulder straps are ok, but the lap belts are a challenge. The inboard side appears to have a 2nd threaded hole (current metric SV chassis) - can I use this? The outer side only has a single threaded boss? Is it safe to use an eye bolt to secure the seatbelt and then clip the harness to it? i prefer to use standard seatbelts for road use which will be most of my driving but want the option. Only other way I can think of doing this is to physically bolt the harness in whenever I want to use it. A bit of a pain but I suppose I could do that.

Thanks guys, perfect answer. Well, not the one I wanted, but it gets me sorted. I'm more than happy to make up wiring, but the simpler I can make it the better. @Jonathan - I have the diagram from the build manual but if you have something more detailed then I would be very interested!

There is a spare red/white wire with a spade termination cable tied to the cigarette lighter feed under the LH dash of my 2016/2017 Sigma (marked RW89 in fig 211 of the Feb 2015c build manual). I was hoping it was a switched live but does not appear to have any voltage on it - anyone know what it is for? I want to wire a switched accessory socket under there. Obviously I can run my own feed, but was hoping to use what is there already. Cheers Jerry