combines44 from the picture it would appear Wby has instructed the manufacturer to glue the pad on.
but, if you look closely at your picture and from the toe of the but pad about one inch up there appears to be a plug in the rubber....
It appears to be a small round slight indentation there...
Poke around and see if the rubber is indeed ''detented'' there (if that is such a word) you might have to punch through and find the screw head if in fact it is not glued.
Just spit balling ...
Rob