Hi Rob   further information can be got from the SCWF site they are specific Seiko Citizen watches.

Thank you all for your helpful comments.   Rob

Here's a brand new one for starters which looks to be the same as yours (?) ... https://www.ebay.co.uk/itm/DIAL-TAG-HEUER-F1-HX0266/302649416687?hash=item46774f9bef:g:m1UAAOSwYNxagv4f . Someone else on this forum might have another source other than ebay. However at this price it's also worth looking out for (non-working) complete watches in good condition. Assuming this is the same as yours then this sold for £41 recently as an example of what can come up if you keep an eye out: https://www.ebay.co.uk/itm/Ladies-TAG-HEUER-F1-200m-Watch-Spares-Or-Repairs-/293105389179  Perhaps one further suggestion is also to consider an alternative Heuer dial. Unless you're set on the pink there seem to be quite a lot of other Heuer dials available. Of course you'd have to double check diameter and dial feet positions but just an idea if all else fails! Good luck!   

Hi Rexxus  The parts you refer to are the center wheel and the canon pinion, One has to remove the canon pinion the remove the center wheel., To do this you will need a removal tool (available on EBAY) to remove the pinion and the center wheel will drop out. I have attached the TZ glossary so as you can identify the various parts by name.  The same tool also is billed as a watch hand remover and provides a parallel upward pull so as not to bend the pinion or indeed watch hands,  happy days TZIllustratedGlossary.pdf

check out a book or video on watch repair. it will help you a lot. vin