Hi Kitty !
I'm not sure what you're looking for ...
We have 18 Tinker Guildmasters that are active around the lands of UO White Wolf. I don't think that is what you are looking for as you can find them quite easily.
What do you mean by : "master tinkerer" ?
We don't have a quest for the tinkering storage key. We will slowly stop supporting the quests for the storage keys. They were badly scripted and many bugs have already had to be fixed so they could work in game. Moreover, the scripter who started that job never finished them all. You can purchase the keys in game, on gold vendors inside our training area.
So, could you please tell me if I answered your question correctly ? Without more details, I fear I can't help you any further.
No that's not what I'm looking for ( they are everywhere ). In Trinsic by the Sons of the sea building , across from the docks is a fellow that gives a quest. His name is Helper Paulson the salvage master. He says to look for the master tinkerer in east brittan . He also sells giant salvage hooks that look like ship anchors. It is a fishing type quest. I already have all of the keys, Ibought them off the gold vendor at training area.
I'm not sure why Helper Paulson was sending you to East Britain, but it's far away from there (but still in Trammel).
Here's a screenshot from our server, and it's is well spawned and active
As I stopped playing UO years ago to dedicate myself to the development part of the game, I didn't know about that quest. But I'm sure you will be able to follow the hints and tricks to find Cousteau Perron.
Good luck !