a umbrella on the repair bench
Examen précis pour déterminer la ou les pièces à  changer.
Il s'agit içi d'une baleine défectueuse, le problème le plus courant : démontage du parapluie en retirant les fils de fer qui relient les baleine à  la noix et aux coulants. Ensuite, en coupant les agrafes qui fixent la toile à la monture.
Close examination to determine one or more pieces to change. You can see in this picture a defective rib, it's the most common problem: dismantling of the umbrella by taking down the metal wires connecting the ribs to the "nut" and the rings. Then, cutting the hooks (staples) that fix the canopy of the frame.
our inventory of umbrella ribs is quite big

You have to find the right rib !

There are a great number of ribs. In the past they were made of solid steel, now they are made of empty steel (Paragon), even of aluminium for ultra light or fibreglass umbrellas for more flexibility.

 
fabrication of a new rib with tiny hole with diameter down to 1.5 mm But it's sometimes necessary to fabricate an identical rib, with much precision, down to the 1,5 mm diameter hole to pass the connecting wire.
reassembling of an umbrella Reassembling the umbrella.

When the ring, the shank or the "nut" is defective, the repair is more important. First you need to dismantle the umbrella, the ribs as seen before, but also the handle and the push button in order to dismantle the umbrella into separate peices.
our spare parts inventory achées pour parapluie" />
Then you have to replace the defective piece by combining with the diameters of the shank, the tips and the number of ribs. 
Generally there are 8 ribs, formerly there were 10. Nowadays the tendency is for an ultra light umbrella models with an always more limited number of ribs.
fixing of the canopy on the umbrella frame End of the repair: The canopy is fixed back to the frame.
repair of an umbrella with a broken tube Other repairs are possible: change of the shank, a tear in the canopy...and many other problems. But everything can be repaired !
retoration of a ancient sunshade. Final view
Different restoration works on ancient umbrella or sunshade can be achieved. 
Here is a sunshade with a broken shank to be restored and recanopied.