Question about Bi-Wire jumpers

Hi,

I recently bought a pair of Spendor SP100's. These speakers are tri-wireable. I have bi-wire cables and have them conected to the woofer and midrange terminals with the factory jumper plates from the midrange to the tweeter. I have read that there is a great improvement to be had if you replace these brass plates with a high quality jumper cable. I have been looking at jumper cables but a friend of mine who is a jeweler has offered to replicate the factory plates in pure silver at a nominal cost. Would this be an worthwile improvement over the brass plates or should just buy decent quality jumper cables?

Emilio