Jury Rigged in the same equip x Tinkerer only one

By sandsme, in Star Wars: Edge of the Empire RPG

Jury Rigged, page 138.

"Choose one armor/weapon per rank" the text don't have a limitation, so can i choose to upgrade my weapon twice if i have rank 2 in Jury Rigged?
Do we have a limit? For me the limit is the rank and you can "stack" upgrades.
It is different from Tinkerer, due to the text below

Tinkerer, page 145,

"he can only do this once per equipment"

I'm wrong?

up?

You have a list of X weapons/armor you have improved, where X is the number of ranks.

It is pretty clear you can only make one change to each in my reading.

I guess it isn't totally specific, but if the answer to the question "which items have you jury-rigged" is "my favourite blaster and then my jury-rigged favourite blaster", that isn't a list of two weapons in my book, but only one.

Quote

Question asked by Donovan Morningfire (Paraprhased) :

Can Jury rig be applied to the same item more than once with each rank.

Answer (Paraprhased):

Jury Rigged is a "one item per rank" talent. So each rank has to be applied to a separate item per the RAW.