ss wrote:

On 17/04/2019 14:58, GB wrote:
I had a similar problem and eventually got the door to open by lifting it
within its frame. It seemed to progressively allow the rollers to clear
their slots. I really can't remember what the fault had been but I fixed it
prefectly with a new locking strip mechanism for the edge of the door.
About £20 off e-bay.

Success, I did the above, put a spanner on the square spindle, levered
up the door and then thumped the spanner.....door opened.

Still not sure what the issue is but will soon find it first warm day I
get and take the mechanism out, first quick inspenction it appears to be
working ok, with the hooks and bolts functioning.

I had a similar mechanism that was very stiff to open or close and found
the whole length of the strip up the door was covered in gummy residue,
presumably of some lubricant. Very thorough cleaning of the strip,
pivots and hooks, and silicon grease, enabled it to work freely.

--

Roger Hayter