Abstract: An adjusting means for controlling the thickness of extrudate exiting from a die. The adjusting means includes a non-flexible block, connected to the die and provided with a tapped hole. Another block, a flexible block is also provided. It is connected to a flexible lip of the die and is also provided with a tapped hole. A bolt which includes a first threaded cylindrical section having a first threaded pitch is also provided. The first threaded cylindrical section is accommodated in the tapped hole provided on the non-flexible block. The bolt further comprises a second threaded cylindrical section having a second thread pitch accommodated in the tapped hole provided on the flexible block. The first and second cylindrical sections are distinguished in that the first and second thread pitches are different.