In article , Tim+ wrote:
charles wrote:
In article , Tim+
wrote:
Chris B wrote:

Now the door worked fine for 20+ years until the first failure of
this type, but having reassembled and re-tensioned it about 5 years
ago it has now failed again in exactly the same manner.

Here's another thought. The spring is simply shagged. It can no longer
maintain enough tension over its full range of movement to reliably
grip the anchor spiral when it's at its lowest tension.

Let's face it, after all these years it doesn't really owe you
anything.

our door springs are at least 35 years old and still work .


Torsion springs? Anyhow, just because yours are fine doesn't preclude
Chris's being shagged.


No, it doesn't but it contracts the suggestion that after 20 years what can
you expect.

--
IT Administrator
London Members' Centre
National Trust for Scotland
Reg Charity SC 027207