The vintage style rocking bridge has been used for many years by Fender on the Jaguar, Jazzmaster, Mustang, Jagstang and Bass VI.
One of the original design concepts of this type of bridge is often misunderstood, namely the rocking action whereby the bridge will rock back and forth when the tremolo is operated.
There is a lot of misleading information on the internet about this subject but the following should help to explain the principle of this feature. -
support posts at either end of the bridge have a pointed screw going
through on which the bridge sits when it is installed. In the guitar
body are two metal cups, or thimbles as they are better known, with a
hole drilled that does not go right through.
These can be seen in the photo of a Fender bridge and thimble below.