[R-390] Filter wire

[quartz55]

I think the wire is getting shorter and shorter.  I've tried 2 times, I get a snap, but not full discharge.  I'm wondering if once the wire has been welded, it just doesn't want to weld any more. I'm sure it's been stressed on the end and even burned a bit.  I've noticed the trial wires I used didn't like welding more than once.  I may try once more, but thin I think it's going to be just too short.  Now where could I find a new piece of wire like this?

http://i251.photobucket.com/albums/gg287/DogTi/R390A/wire_zpsa08cce0d.jpg