Below are links to write-ups and guides on how to carry out service jobs, maintenance and modifications. Many thanks to the authors for posting such useful information on the web.
I cannot accept responsibilty for any problems caused by carrying out any of these tasks.

Miata Wiring Diagrams This site hosts free Adobe Acrobat PDF versions of Miata wiring diagrams for years 1990-2000. I'm guessing they could be very useful to MX-5 or Roadster users but I don't understand them at all!

Differential, Transmission and Turret Oil changes

Changing the front brake pads.

Changing the rear brake pads.

More brake info here.

Changing the Mk1's fuel filter.

How to fix your electric aerial -You can buy replacement masts here.

Fitting Central Locking. - More information is here.
I can recommend the kit available from here - Autoeurope - a good quality kit at a great price and top class after-sales help. I have no affiliation with this company, just a happy customer!

£6.00 Boot Lights.

£6.00 Interior Courtesy Lights.

Glyn Handley's guide showing how to re-trim your door panels.

Removing Tie Down Hooks (Baby Teeth).

More info on removing Tie Down Hooks, including MK2 cars.

Fitting a Windblocker.

Andy Thompson's guide to installing a new roof.

More info on installing a new roof, including many photos.

Andy Thompson's excellent Eunos Roadster FAQ (Frequently Asked Questions).

Useful hints and warnings for driving in France.