From memory you are right its about 10kg saving using normal wire.
So for example if a standed loom weight is 25kg, by removing all the crap it will be reduced to 10-15kg but if you make one out of the teflon it would be around 5-8kg.
It has been something i have been thinking about for a while but i am very time poor at the moment because of work so i take ages to do anything.
At this moment i am getting prices on the teflon wire from a company over here, hopefully wont to be too bad as ill buy all thier off-cuts (mind you most 'off-cuts' would be about 10m long).
If i could get my hands on the complete loom i would be able to make something, hang on i know someone who has one *runs to the phone*