V brake centering woes! Help please.

I have an old MTB with basic Tektro V brakes. Theres no centering screw on any of the four of them so it makes life difficualt when one goes out.
Problem is that the front R/H one is now moving against the brake pillar once pulled and will not spring back any more, even if I bend the tension arm back.
Basically, it won't stay put against the pillar but moves with the arm.
Any ideas or do I just have to bite the bullet and buy a new one?
Problem is that the front R/H one is now moving against the brake pillar once pulled and will not spring back any more, even if I bend the tension arm back.
Basically, it won't stay put against the pillar but moves with the arm.
Any ideas or do I just have to bite the bullet and buy a new one?
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is it friction in the cable or is it the arm?
I would bin them and change the cables at the same time.
a rension screw is really rather good to have.
Parktools :?:SheldonBrown
Thanks.
Thanks.