Maintenance-free Tribos Mini and SVL extensions can hold circuit board tools with straight shanks, eliminating need for special cutting tools with larger tool shanks. Clamping process can be done in 30 sec by means of manual SVP-2 or automatic SVP-3 clamping devices with corresponding reduction inserts. Runout accuracy and repeatability are less than 3 microns, and with rotational symmetric design, basic counterbalance of less than 4 g/mm is guaranteed.