Small push-button switch

Surely that large screw on cover/fixing would cover the odd 2mm extra clearance on the hole. With the old switch are you measuring the size of the hole or are you measuring the outside diameter of the tread on the switch?

I've had similar quests for small rocker switches and you just have to persever I fear. They're so cheap that you can risk buying without too much of a loss. I now have extensive stocks of quite a variety of small rocker switches! :-)

Good sources other than eBay might be CPC and/or aliExpress (though you have a bit of a wait then).

You might also consider converting to a small rocker switch instead of the push button one, I certainly have a lot of 12mm ones. :-)

Believe it or not I got a replacement for this sort of switch from B&Q. Its not on their website of course but it was on the shelf with all of the electrical bits and bobs (fuse wire, choc blocks, heat shrink etc). If you are close to or passing it may be worth a look.

From the data sheet this one from CPC looks to fit a 12mm hole

Manufacturer: PRO ELEC Manufacturer Part No: PELR0258 Order Code: SW05520

Owain

Can be tricky.

Diameter or length?

If we are talking diameter here ... and assuming the switch doesn't screw into a thread in the lamp, would a 3D printed 'washer' or top-hat tube do it?

Looks likely to be the case, depending on how the rest of the 'box' is measured.

Cheers, T i m

Why not ask the seller for clarification. Alternatives are mentioned at the bottom of that page on Ebay.

Try RS, CPC, Rapid, etc. Vast range of mains rated push button switches of all types. But look out for a minimum charge and or high P&P on a small order.

Yes it does, thank you. Also the width of body and dia. of thread are the same - I'd forgotten that they could be that. I can't be certain of the threads on mine as one would need some possible destruction to get at (glued-on cloth) and I'm not risking unscrewing the top incase it won't re-tighten; the other I can't unscrew without holding the body and that means removing the lamp holder. In an Anglepoise-style shade that's not easy for big hands. Many thanks for all of the suggestions. I'll have to try and get a better idea of the threads. One of the domes is actually 12mm OD, so the thread could be 10mm. BTW, I still have a 15/32" inch drill bit for making 12mm holes - it's rather ancient now.