Instruction:
1. Loosen the thumb screw in front block to open the pin hole.
2. Remove protective cap on scribing pin, put it through the hole for required length, tighten the screw to lock.
3. Loosen the thumb screw on top of the caliper to slide it to required spacing, tighten the screw to lock.
4. Place the lower end of the sliding block against the edge of the parts then move caliper laterally to scribe.
