Issue link: https://docs.hic.us/i/852277
87 Chapter 7 Using Optional Accessories 7 2. Loosely screw in the knobbed screws (two places, at right and left) at the lower part of the frame drive system. 3. Position the center, cylindrical part of the cap frame unit onto the ring shaft, and slide the cap frame unit in, along the ring shaft. 4. On the connecting part of the cap frame unit there are two slits (at right and left). Slide in the cap frame unit until these two slits are engaged by the two knobbed screws, and until the unit cannot be pushed in any further. 5. Tighten the knobbed screws (two places, at right and left) that were attached in step 2. If the interconnecting portion of the cap frame unit is difficult to push in when attaching the cap frame unit for the first time, try loosening the fastening screw of the revolving ring and adjusting the position.