rebuilding/repairing your AFM

[TomoHawk]

I'm pretty sure my resistance track on my airflow meter (78 280Z) is totally worn out, or just really worn. The resistance with the flap closed isn't (near-zero) like the book says, and it doesn't go up smoothly with movement of the flap. I could order a used one, but then I'd have two, so why not have a go at fixing the resistance trip? I think I'd probably need to graft one from another source, like a giant potentiometer or another similar AFM. Or is there a source of material used to make resistance strips?

thx