In case of contact failure, using WD-40 can be a solution. BUT! If you watch the repair video, you will see that there is little chance of this!
You must be registered to see the links
View attachment 2310563
View attachment 2310576
Moreover WD-40 mostly contains paraffin, which is not exactly good for the panel varnish layer.
View attachment 2310590
Furthermore drifts can also be caused by the spring under the stick which when weakened! <- I had this problem too.
And this problem is not solved by the contact spray!
(I also stretched the spring a little and since then everything is fine again)