Complete from the US, box, vintage look and all. https://www.ebay.it/itm/Seitz-Jeweling-tool-set-with-reamers-pushers-anvils/274079345666 about £300, maybe use a reshipper to lessen customs charges. I have nothing against the Chinese, it's just that in this case their value proposition is not that compelling.

I am wanting to start to try to repair my broken side winder.  Where should I post my questions on what may be wrong and how to start?

https://www.cousinsuk.com/product/horia-jewelling-tool https://www.cousinsuk.com/product/assortment-24-pump-pushers-24-anvils

Would the chinese one not be sufficient though? The tool and full set of 24 stakes and puches for less than £300 The Horia tool and 24 piece set is £1278 on Cousins

In this case the difference is not 1:10. A Seitz before stakes and punches is £290 + VAT https://www.cousinsuk.com/product/seitz-jewelling-tool-with-spindle Maybe you can get the needed one as you go. Or bite the bullet for the complete set at £875 + VAT. And I'm sure there are deals on Ebay if patient.