my plan is to put the usual restiction thingy in the neck

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the cap itself screws on, and screws down about 25mm onto the neck before its closed tight. the plan is to get a small loop welded on to the inside of the filler cap, onto which a wire rope is looped through and clamped with the tiniest clamp i can find.

the rope passes through one of the holes in the restrictor plate and round a large washer which is too big to pass through the hole in the restictor

hopefully, screwing the cap means the rope will turn in the tank and won't twist up, and will teather the cap to the tank as required.

anyone see any problems with that?

Sounds fine. Or use bathplug chain which is perfectly happy being twisted as much as you like.

ah good idea! i did think of it briefly couldn't think of how to attach it at each end though, and then forgot all about it. i'm sure all the bits to do it are out there, just a case of finding them lol

why not just put the chain through the hole attached to the middle of a rod that is twice the length of the hole.

When you pull on the chain the rod will get stuck in the hole due to being too big to get through.

Its what i believe they used to do on land rover tanks to tether the cap.

yep, had though about that too. if i go the bath chain route, they've got a end bead with a hole in it, i could thread a key ring (split ring) onto each end which would do it

did mine like this very cheep and simple

Mine is exactly the same as you describe. It didn't come with a tether so I rang Newton Equipment and they sent me one FOC.

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Originally posted by ashg
did mine like this very cheep and simple

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i was thinking about the leaking situation - i'd guess it would be virtually none and a copper washer under the nut would possibly make sure its actually none.