panosgr said:I changed yesterday the cork pads at the back of the keys so they do not make noise when they hit the body of the sax.
It was a success and the knocking reduced drastically./quote]
Do you mean you changed from what WAS there to something different?
There are modern materials that actually silence better than cork.
"When I blow the horn though I hear it different.
The distance between key pads and holes has closed a little bit(not dramatically).Could this affect intonation"
You must have changed the thickness of that material. It is possible on most instruments, with appropriate bending of key stops and making necessary adjustments, to change the thickness of the thickness of silencing materials and keep the same key openings. It is a common part of routine work on a sax.
However I suggest that you may be a bit out of your depth to attempt this. Leave it to a good technician.
Most adjustments affect other adjustments, so they must be carried out as a coordinated package.
Depending on the situation, e.g the surface area, the distance from the hinge fulcrum, the travel, the strength of of the spring, etc:panosgr said:Gordon, what materials do you use for this location(cushioning the backplate of the key so it doesn't knock when it hits the body of the sax)?
I rather like the old tried and true method of combining felt and cork.panosgr said:what materials do you use for this location(cushioning the backplate of the key so it doesn't knock when it hits the body of the sax)?